JP6526048B2 - Branched polyester polymer and soft touch coating containing the same - Google Patents

Description

This application is a continuation-in-part of US Patent Application No. 12 / 752,570, filed April 1, 2010, entitled "BRANCHED POLYESTER POLYMERS AND COATINGS COMPRISING THE SAME".

FIELD OF THE INVENTION The present invention relates to crosslinkable branched polyester polymers prepared by free radical polymerization of the double bonds of a first unsaturated polyester prepolymer and a second unsaturated polyester prepolymer. The polyester polymer has a Tg of 25 ° C. or lower. The invention further relates to coatings comprising such polyesters, and to substrates on which such coatings are applied, which, when cured, imparts a soft touch to the substrate.

BACKGROUND OF THE INVENTION Conventional linear and branched polyester resins made by the polycondensation of various combinations of polyols and polyacids are widely used in the coating industry. These are used to coat a wide variety of metallic and non-metallic substrates used in many different industries. These industries particularly include those where flexible coatings are desired. Particularly suitable examples include substrates used in the packaging industry, coil coatings and certain industrial and automotive coatings. It is often desirable that the coating have a specific "touch feel". For example, in the consumer electronics industry, coatings with a "soft feel" or "soft touch" are often desired. Soft touch coatings can impart a range of touch feel to a substrate, such as a velvety feel, a silky feel or a rubbery feel. Regardless of the feel of the coating, it is also desirable that the coating have at least some resistance to abrasion, marring, scratching and / or contamination. Thus, soft touch coating with acceptable performance characteristics is desired.

The present invention provides, for example, the following:
(Item 1)
A crosslinkable branched polyester polymer prepared by free radical polymerization of the double bonds of the first unsaturated polyester prepolymer and the double bonds of the second unsaturated polyester prepolymer, wherein each prepolymer is independently ,
a) Polyol segment,
b) unsaturated polycarboxylic acids and / or their anhydrides and / or esters
Including
A polyester polymer wherein said branched polyester polymer has a Tg of 25 ° C. or lower.
(Item 2)
The polyester of claim 1, wherein the prepolymer further comprises a soft segment.
(Item 3)
The polyester of claim 2, wherein the soft segment comprises adipic acid.
(Item 4)
The polyester of claim 1, wherein the prepolymer further comprises isophthalic acid.
(Item 5)
The polyester of claim 1, wherein the polyol segment comprises 2-methyl-1,3-propanediol.
(Item 6)
The polyester of claim 1, wherein the unsaturated polycarboxylic acid / anhydride / ester comprises maleic acid / anhydride / ester and / or itaconic acid / anhydride / ester.
(Item 7)
The polyester according to claim 2, wherein at least one prepolymer comprises adipic acid, 2-methyl-1,3-propanediol and maleic acid / anhydride / ester.
(Item 8)
The prepolymer _{M W} is 5,000 to 10,000, a polyester of claim 1.
(Item 9)
Wherein a polyester of _{M W} is 4,000 to 10,000, a polyester of claim 1.
(Item 10)
The polyester according to item 1, wherein the Mark-Houwink parameter of the polyester is 0.48 or less.
(Item 11)
A coating, comprising the polyester according to item 1 and a crosslinker therefor.
(Item 12)
A hardness of ² to 10 N / mm ² as measured by the Fisher microhardness test, a coefficient of friction of 0.05 to 0.2 as measured by ASTM method D1894, 250 to 500 cycles as measured by ASTM method F2357 12. A coating according to item 11, having an abrasion resistance and / or a surface roughness of 20 [mu] m to 50 [mu] m as measured with a Taylor-Hobson precision certronic duo roughness machine.
(Item 13)
The coating of claim 11, wherein at least one of the prepolymers comprises adipic acid, 2-methyl-1,3-propanediol and maleic acid / anhydride / ester.
(Item 14)
The coating of claim 11, further comprising a colorant.
(Item 15)
The coating of claim 11, wherein the crosslinker comprises an isocyanate.
(Item 16)
A substrate coated with the coating according to item 11 at least in part.
(Item 17)
17. A substrate according to item 16 comprising a consumer electronics component.
(Item 18)
The substrate according to item 16, comprising PC / ABS.
(Item 19)
The substrate according to item 16, comprising a metal can.
(Item 20)
The polyester according to item 1, wherein the polyester does not contain (meth) acrylate or its residue.
(Item 21)
The polyester according to item 1, wherein the only unsaturation in the prepolymer is from component b).
SUMMARY OF THE INVENTION The present invention is a crosslinkable branched polyester polymer prepared by free radical polymerization of a double bond of a first unsaturated polyester prepolymer and a double bond of a second unsaturated polyester prepolymer, Each prepolymer independently comprises: a) a polyol segment; b) unsaturated polycarboxylic acids and / or their anhydrides and / or esters, said branched polyester polymers having a Tg of 25 ° C. or lower It is directed to polyester polymers having a Tg. Coatings comprising such polyesters are also within the scope of the invention, as are substrates coated at least in part with such coatings.

DETAILED DESCRIPTION OF THE INVENTION The present invention is generally directed to a crosslinkable branched polyester polymer comprising the reaction product of a prepolymer, which comprises a polyol segment and an unsaturated polycarboxylic acid and / or its anhydride and / or its anhydride and / or its anhydride. Or a reaction product of a component containing an ester. This prepolymer is an unsaturated polyester, and may be referred to herein as "unsaturated polyester prepolymer", "prepolymer" or similar terms. Free radical initiators are used to initiate polymerization via unsaturation of unsaturated polyester prepolymers, thereby leading to branched polyesters. The branched polyester is crosslinkable, which means that it can be crosslinked with another compound. That is, the polyester has a functional group that reacts with a functional group on another compound such as a crosslinker. Unsaturation reaction of the prepolymer leads to crosslinkable branched polyesters. This polyester is a polymer. It is not a cured coating. Thus, the present invention differs from the prior art in which crosslinking of the unsaturated sites on the monomer and / or polymer results in a cured coating.

  The unsaturated polyester prepolymer comprises polyol segments. As used herein, "polyol" and like terms refer to compounds having two or more hydroxyl groups. The polyol used to form the polyol segment may be referred to herein as a "polyol segment monomer". The polyol can be chosen to contribute to the softness of the prepolymer. However, polyols can also contribute to hardness, so the polyols used and their respective amounts are branched polyesters whose unsaturated prepolymers have a Tg of 25 ° C. or lower when reacted You must choose to bring The polyol suitable for use in the present invention may be any polyol or mixtures thereof known to make polyester. Examples thereof include, but are not limited to: alkylene glycols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, hexylene glycol, polyethylene glycol, polypropylene glycol and neopentyl glycol; hydrogen -Bisphenol A; cyclohexanediol; 1,2-propanediol, 1,3-propanediol, butylethylpropanediol, 2-methyl-1,3-propanediol and 2-ethyl-2-butyl-1,3-propane Propanediol containing diol; Butanediol containing 1,4-butanediol, 1,3-butanediol and 2-ethyl-1,4-butanediol; trimethyl pen Pentanediol including 2-diol and 2-methylpentanediol; cyclohexanedimethanol; hexanediol including 1,6-hexanediol; caprolactone diol (eg, reaction product of ε-caprolactone and ethylene glycol); hydroxy-alkylated bisphenol Polyether glycols such as poly (oxytetramethylene) glycol; trimethylolpropane, pentaerythritol, di-pentaerythritol, trimethylolethane, trimethylolbutane, dimethylolcyclohexane, glycerol and the like are included. The unsaturated polyols suitable for use in the present invention may be any unsaturated alcohol containing two or more hydroxyl groups. Examples include, but are not limited to, trimethylolpropane monoallyl ether, trimethylolethane monoallyl ether and prop-1-ene-1,3-diol. The polyol segment can also include some monol, such as up to 10 wt% or 5 wt% based on the total weight of the polyol segment. In certain embodiments, the polyol segment comprises 10 to 90 wt%, such as 30 to 50 wt% of the polyester prepolymer. The proportion of polyol in the prepolymer can vary widely depending on the molecular weight of the polyol segment.

  The unsaturated polyester prepolymer further comprises unsaturated polycarboxylic acid / anhydride / ester. The unsaturated polyacids suitable for use in the present invention are any unsaturated carboxylic acids containing two or more carboxy groups, and / or their esters and / or anhydrides, or mixtures thereof May be there. Examples include, but are not limited to, maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid and tetraconic acid and / or their esters and / or anhydrides. These esters may be C1 to C18 alcohols (e.g. methanol, ethanol, 1-propanol, 1-butanol, 2-butanol, isobutanol, 1-pentanol, 1-pentanol) when the unsaturated polyacid is in the form of an ester. It may be formed of any suitable alcohol, such as C1-C18 alkyl ester formed by the reaction of pentanol and 1-hexanol) with a polyacid. Particularly suitable unsaturated polyacids are maleic acid, maleic anhydride, or C1-C6 alkyl esters of maleic acid. In certain embodiments, the unsaturated polycarboxylic acid / anhydride / ester comprises 3 to 25 wt%, such as 5 to 20 wt% of the polyester prepolymer.

The polyester prepolymer can further include one or more monomers that contribute to the overall properties of the polyester, including "softness." For example, one or more monomers contributing to the "soft segment" can be used with one or more polyols and one or more unsaturated polycarboxylic acids / anhydrides / esters. As used herein, "soft segment" and similar terms are monomers or residues thereof that can provide flexibility to the prepolymer and help achieve the desired Tg and / or viscosity of the branched polyester Or a mixture of them. The soft segment may be, for example, the residue of a polyacid. As used herein, "polyacid" and like terms refer to compounds having two or more acidic groups, including esters and / or anhydrides of the acid. Such acids can include, for example, linear acids that impart flexibility. Examples include, but are not limited to, saturated polyacids such as adipic acid, azelaic acid, sebacic acid, succinic acid, glutaric acid, decanedioic acid, dodecanedioic acid and its esters and anhydrides. Suitable monoacids include C ₁ -C ₁₈ aliphatic carboxylic acids such as acetic acid, propanoic acid, butanoic acid, butanoic acid, hexanoic acid, oleic acid, linoleic acid, unolic acid, lauric acid, isononanoic acid, other fatty acids and naturally occurring acids And / or esters and / or anhydrides of any of these.

  In certain embodiments, one or more additional acids can also be used. For example, the additional acid may be an aromatic acid or a cycloaliphatic acid, suitable examples of which include, but are not limited to, phthalic acid, isophthalic acid, 5-tert-butylisophthalic acid, tetrachlorophthalic acid Benzoic acid, t-butyl benzoic acid, tetrahydrophthalic acid, naphthalene polycarboxylic acid, terephthalic acid, hexahydrophthalic acid, methyl hexahydrophthalic acid, dimethyl terephthalate, cyclohexane dicarboxylic acid, chlorendic anhydride, 1,3-cyclohexane Dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, tricyclodecane polycarboxylic acid, endomethylene tetrahydrophthalic acid, endoethylene hexahydrophthalic acid, cyclohexane tetracarboxylic acid, cyclobutane tetracarboxylic acid, and esters and / or anhydrides thereof Preliminary / or combinations thereof. It is understood that some of the additional acids listed above impart rigidity to the branched polyester and thus may increase the Tg of the branched polyester. Thus, when using one or more of the above acids, the acid used and the amount of each acid is such that the branched polyester has a Tg of 25 ° C. or lower when the prepolymer is reacted As you have to choose.

  Other monomer components can also be used in the formation of prepolymers to impart one or more additional properties to the branched polyester and / or the coating comprising it. For example, phthalic anhydride can be included, such as in an amount of 2 to 20% by weight of the prepolymer; phthalic anhydride can impart higher stain resistance to the coating. Furthermore, copolymerization of the unsaturated prepolymer with PDMS silmer acrylate may impart flexibility and / or improve fingerprint resistance in the final coating. Such silmer acrylate monomers can be used in any suitable amount, such as 0.1 to 10 wt%. Aliphatic diacids can be added to increase the hydrophobicity, while polyethers such as polyTHF can be used to make the branched polyester more hydrophilic.

  Unsaturated polyester prepolymers can be prepared by any means known in the art. In one embodiment, the soft segment and the polyol segment are prereacted to form what is sometimes referred to herein as a "polyol prepolymer" and then with the unsaturated polycarboxylic acid / anhydride / ester Let it react further. In another embodiment, the polyol segment and the unsaturated polycarboxylic acid / anhydride / ester are reacted together with or without the soft segment. When including soft segments, the polyol is generally in excess over the soft segments. For example, the ratio of reactive groups on the soft segment monomer to reactive groups on the polyol segment monomer may be 1: 2, or 2: 3, or more. The higher the ratio, the higher the molecular weight of the reaction product. The reaction product has terminal hydroxyl functional groups since an excess of polyol is used. This functional group remains unreacted in the preparation of the branched polyester, thereby making it "crosslinkable" with another compound. Similarly, if soft segments are not used, the prepolymer has terminal hydroxyl or acid functional groups that can crosslink with another compound.

  As mentioned above, according to the invention, the Tg of the crosslinkable branched polyester is 25 ° C. or lower. In certain embodiments, the Tg of the prepolymer that is reacted to form the branched polyester is also 25 ° C. or lower. In other embodiments, the Tg of one or more prepolymers may be greater than 25 ° C., but the Tg of one or more prepolymers may be 25 ° C. or lower, and As a result, when reacted, the resulting branched polyester has a Tg of 25 ° C. or lower.

  Following formation of the unsaturated polyester prepolymer, the prepolymer is then polymerized in the presence of a free radical initiator. That is, the unsaturation of the first polyester prepolymer is reacted with the unsaturation of the second polyester prepolymer. It is understood that this reaction occurs by free radical polymerization. Any free radical initiator commonly used to initiate the polymerization of unsaturated compounds containing double bonds can be used in this free radical polymerization. For example, the free radical initiator may be an azo initiator, or a peroxide initiator such as tert-butylperoxy-2-ethylhexanoate, tert-butylperoxybenzoate or dibenzoyl peroxide. The ratio of initiator to unsaturated acid / anhydride / ester may be varied depending on the degree of branching of the polyester chain desired. For example, the molar ratio of initiator to double bond may be 0.001 to 1.0, such as 0.01 to 0.9 or 0.5 to 1.

  If a higher amount of initiator is used, more branching will be achieved. An increased degree of branching generally means higher functionality in the polyester. In certain embodiments, lesser amounts of initiator, such as 0.1, can be used to minimize the amount of branching in the polyester and keep some unsaturation. Such embodiments may be able to provide particularly desirable flexibility in the final coating.

  Unsaturation from one acid / anhydride / ester moiety in the prepolymer reacts with the unsaturation of the other prepolymer. The result is a branched polyester polymer. At least a portion, if not all, of the branches will have terminal hydroxyl groups. Depending on the starting materials used, pendant functional groups may be present in the branched polyester. Generally, linear polymers result when initiators are used in conjunction with unsaturated acids / anhydrides / esters. Thus, achieving branched polyesters according to the invention was a very surprising and unexpected result. It is understood that the branching in the present invention is mainly achieved by the reaction of unsaturation. Mild branching can be provided by the use of triols or tetraols, but the amount of such compounds must be chosen such that gelling is avoided. The process of the invention for achieving branching by the use of unsaturated polymerization of polycarboxylic acids, and the resulting polyesters, are conventional branched polyesters such as those made by the use of triols or tetraols. It is understood that it is very unique when compared with.

  In certain embodiments, the branched polyesters of the invention have a degree of branching, or mark, of less than 0.58, eg 0.50 or less or 0.48 or less, as measured by triple detector GPC Have Mark-Howink parameters.

  Depending on the degree of control of the polymerization desired, the initiator can be added in different amounts at different times. For example, all of the free radical initiator may be added at the start of the reaction, or the initiator may be split into multiples, and more than one may be added at intervals between the reactions Or, the initiator may be added in a continuous feed. It is understood that addition of initiator at set intervals or continuous feed will result in a more controlled process than if all of the initiator was added at the start. In certain embodiments, the initiator is added over 10 minutes until the molecular weight of the polyester is doubled or tripled. Free radical polymerization controls controlling parameters such as molecular weight of branched polyester, degree of functionality, amount of branching, etc., so as to obtain a branched polyester giving the final coating the desired feel and properties. It can be carried out under various conditions which make it possible.

  If the polyol prepolymer is initially formed or, if used, how to add an initiator whether to react the soft segment monomer and the polyol segment monomer directly with the polycarboxylic acid / anhydride / ester Regardless of the procedure by which the polyester prepolymers are made, etc., the resulting branched polyester is actually a mixture of polyesters with varying degrees of unsaturation, chain length, branching and the like. Some of the resulting products may be monoesters, but still this is included in the term "polyester" as used herein.

  The temperature at which the free radical polymerization reaction is carried out depends on factors such as the composition of the unsaturated acid / anhydride / ester, the polyol segment monomer, if used, soft segment monomer, initiator, solvent and properties, as desired in the polyester It can change. In general, free radical polymerization is carried out at a temperature of 50 ° C to 150 ° C. In typical polymerizations, such as acrylic polymerization, higher temperatures result in higher concentrations of free radical initiators, which in turn result in more chains being polymerized, each having a relatively low molecular weight Have. It has surprisingly been found that in the system according to the invention, especially when using maleic acid, the higher the initiator concentration, the higher the molecular weight of the resulting polymer. This is a surprising result that one skilled in the art has not predicted that the polymerization of the present invention will occur. However, too much initiator can lead to gelation. Thus, in certain embodiments, the polyesters of the present invention do not gel.

  While polymerization may be carried out using any means for ease of handling, free radical polymerization may be carried out using unsaturated acid / anhydride / ester and polyol prepolymers (or soft segment monomers and polyol segment monomers) Solution can be used. Any solvent can be used as long as it can dissolve the component containing the free radical initiator to a degree sufficient to allow the polymerization to occur efficiently. Typical examples of suitable solvents include butyl glycol, propylene glycol monomethyl ether, methoxypropyl acetate and xylene. The preparation of the polyester in a solvent may be referred to herein as a "solvent based system", which is more than 50% of the solvent, eg up to 100% organic solvent, 50 of the solvent % Means that for example less than 20%, less than 10%, less than 5% or less than 2% of the solvent is water.

  Alternatively, the polyester can be prepared in a water based system. A "water-based system" is more than 50% of the solvent, eg up to 100% water, and less than 50% of the solvent, eg less than 20%, 10%, 5% or 2% of the solvent organic It is a solvent. However, in certain embodiments, the polymerization is conducted without a solvent. That is, all steps from prepolymer preparation to polyester preparation can be carried out in the absence of a solvent.

  In either solvent-based systems, water-based systems or solvent-free systems, the resulting polyester may be a liquid, such as a viscous liquid.

  As noted above, the branched polyesters of the present invention are formed by free radical polymerization through the double bonds of the first and second unsaturated polyester prepolymers. The first and second prepolymers may be the same or different. In certain embodiments, two or more different unsaturated polyester prepolymers can be reacted together. In this context, "different" means that the amounts of one or more components used in the unsaturated polyester prepolymer and / or one or more components used in the unsaturated polyester prepolymer differ. It means that it is good. For example, polyesters according to the invention can be prepared using polyol prepolymers composed of the same components, but in other embodiments, they can be two or more formed by different components It can be prepared by using a polyol prepolymer. That is, the first polyol prepolymer containing terminal hydroxyl groups and the second polyol prepolymer containing terminal hydroxyl groups are reacted with unsaturated acid / anhydride / ester. The components used to make the first and second prepolymers may be different and / or have one or more different components and / or use the same components If so, it can have one or more different amounts. In this embodiment, the resulting polyester may have random units derived from each type of prepolymer used. Thus, the present invention includes polyesters prepared by the same or different polyol segment monomers and / or unsaturated acids / anhydrides / esters and / or prepolymers having either the same or different amounts of these; Furthermore, each of the prepolymers can have the same or different soft monomers and / or additional acid monomers and / or the same or different amounts of either of these. The use of different polyol prepolymers, soft segment monomers, polyol segment monomers, additional monomers, unsaturated acids / anhydrides / esters and / or any amount of these can result in polyesters having different properties. In this manner, polyesters can be formed having a Tg of 25 ° C. or lower, and optionally having other desirable properties derived from the use of certain components used in the prepolymer .

  In a particularly suitable embodiment, the prepolymers used according to the invention are, for example, in amounts of 10 to 60% by weight of adipic acid (soft segment), for example 0 to 50% by weight, based on the total monomer weight in the prepolymer. % Of 2-methyl-1,3-propanediol (polyol segment) and, for example, up to 25% by weight, for example 5 to 20% by weight of maleic anhydride. Additional monomers such as isophthalic acid or terephthalic acid, phthalic acid, succinic acid and neopentyl glycol can also be used.

  As noted above, branched polyesters are formed by using free radical polymerization, in which the unsaturation of the polycarboxylic acid / anhydride / ester moiety in the prepolymer polymerizes. In certain embodiments, as described above, the reaction is conducted such that substantially all unsaturation is reacted in forming branched polyesters, while in other embodiments the resulting polyester has some degree of failure. Also includes saturation. For example, the resulting polyester can contain sufficient unsaturation to render the polyester reactive with other functional groups via the point of unsaturation.

  Since the branched polyesters according to the invention are mainly formed by unsaturated free radical polymerization in prepolymers, their terminal hydroxyl groups remain unreacted in the branched polyesters of the invention Become. These unreacted hydroxyl groups can then be cross-linked with other components. Thus, the present invention differs from the prior art in which a gelled polyester is formed which is a widely reticulated polyester. The polyesters of the present invention are thermosetting and thus also differ from the prior art teaching thermoplastic polyesters.

  In certain embodiments, it may be desirable to convert some or all of the hydroxyl functional groups on the unsaturated polyester prepolymer and / or on the branched polyester to another functional group prior to performing polymerization. . For example, hydroxyl can be reacted with a cyclic anhydride to provide an acid functional group. Acid esters can also be formed.

  In certain other embodiments, unsaturated polyester prepolymers can include bonds in addition to ester bonds. For example, the polyester prepolymer can further include one or more urethane bonds. Urethane linkages can be introduced by reacting an excess of polyol prepolymer or unsaturated polyester polymer with the polyisocyanate. The resulting unsaturated polyester prepolymer will still contain terminal functional groups and unsaturation, but will have urethane linkages in addition to the ester linkages. Other chemical properties can also be introduced. Thus, in certain embodiments, unsaturated polyester prepolymers include one or more bonds in addition to ester bonds.

  In certain other embodiments, the use of unsaturated monomers other than the unsaturated polyacid / anhydride / ester of the prepolymer product is excluded. For example, in certain embodiments, the use of vinyl monomers such as (meth) acrylates, styrene, vinyl halides can be excluded. In such embodiments, PDMS silmer acrylate may still be used if the double bonds of the acrylate moiety react in the formation of the prepolymer. Alternatively, similarly, any other acrylate containing monomer or polymer or methacrylate containing monomer or polymer may be used if the double bonds of the acrylate moiety are reacted in forming the prepolymer. That is, the acrylate double bond is reacting and therefore can not be utilized to react with the unsaturation of the second prepolymer during free radical polymerization. It is understood that the branched polyesters of the present invention are widely known in the art and are not polyester / acrylic graft copolymers which are not formed by the reaction of unsaturation on the first and second polyester prepolymers.

  In certain embodiments, the polyesters of the present invention specifically exclude polyesters prepared from prepolymers formed by reaction with aldehydes. Thus, in this embodiment, the acyl succinic acid polyester is specifically excluded. Likewise, the use of aldehydes in solvents is specifically excluded in certain embodiments of the invention.

The branched polyesters of the present invention can have relatively high molecular weight and relatively high functionality as compared to conventional linear polyester resins. In general, the ratio of _{M W} branched weight average molecular weight of the polyester ( _{"M W")} with an unsaturated polyester prepolymer of the present invention, 1.2 to 100, but for example, 4 or 5 to 50, a specific In embodiments, it may be larger.

  In certain embodiments, the polyester prepolymer can have a Mw of 1,000 to 50,000, such as 5,000 to 10,000 or 7,000 to 8,000. Furthermore, the final branched polyester can have a Mw in the range of 2,000 to 100,000, such as 4,000 to 10,000. The Mw of the prepolymer can be related to the properties of the branched polyester as well as the coating comprising the polyester. For example, branched polyesters having a lower limit Mw of that range, such as less than 10,000, may give higher crosslink density or hardness in the coating as the functionality becomes higher and better Flowability and lower viscosity, while branched polyesters with Mw greater than 10,000 provide coatings with lower crosslink density or hardness but different touch feel there is a possibility.

  In certain embodiments, the equivalent weight of the polyester is 1000 or less. The equivalent weight is the Mw divided by the average functionality. The equivalent weight contributes to the crosslink density which can affect the properties of the soft touch coating as described above. For example, higher equivalents may result in lower crosslink density.

In addition to the above molecular weights, the branched polyesters of the invention can also have relatively high functionality. In some cases, the functionality is greater than expected for conventional polyesters having such molecular weights. The average functionality of the polyester may be 2.0 or more, such as more than 2.5 or 2.5, 3.0 or 3.0, or even higher. As used herein, "average functionality" refers to the average number of functional groups on the branched polyester. The functionality of the branched polyester is not measured by unreacted unsaturation but by the number of hydroxyl groups remaining unreacted in the branched polyester. In certain embodiments, the hydroxyl number of the branched polyesters of the invention may be 10 to 500 mg KOH / gm, such as 30 to 250 mg KOH / gm. In certain embodiments, it branched polyesters of the present invention, both large _{M W} and a high functionality, e.g. ≧ 15,000, for example 20,000 to 40,000 or 40,000 more than _{M W} and, It will have a functionality of 100 100 mg KOH / gm.

  Because the polyesters of the present invention contain functional groups, this is a coating formulation in which hydroxyl groups (and / or other functional groups) are cross-linked with other resins and / or crosslinkers commonly used in coating formulations. Suitable for use in Accordingly, the invention is further directed to a coating comprising a branched polyester according to the invention and a crosslinker therefor. The crosslinker or crosslink resin or crosslinker may be any suitable crosslinker or crosslink resin known in the art to be selected to react with the functional group (s) on the polyester become. The coatings of the present invention are free of any such unsaturation via the reaction of the crosslinker with hydroxyl groups and / or other functional groups, not via the double bonds of the polycarboxylic acid / anhydride / ester moiety. It is understood that it cures to the extent present in the branched polyester.

  Nonlimiting examples of suitable crosslinkers include phenolic resins, amino resins, epoxy resins, isocyanate resins, beta hydroxy (alkyl) amide resins, alkylated carbamate resins, polyacids, anhydrides, organometallic acid functional materials , Polyamines, polyamides, aminoplasts and mixtures thereof. In a particular embodiment, the crosslinker is a phenolic resin comprising an alkylated phenol / formaldehyde resin having a functionality of ≧ 3 and a difunctional o-cresol / formaldehyde resin. Such crosslinkers are commercially available from Hexion as BAKELITE 6520 LB and BAKELITE 7081 LB.

  Suitable isocyanates include polyfunctional isocyanates. Examples of polyfunctional polyisocyanates include aliphatic diisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate and aromatic diisocyanates such as toluene diisocyanate and 4,4'-diphenylmethane diisocyanate. The polyisocyanate may be blocked or unblocked. Examples of other suitable polyisocyanates include isocyanurate trimers, allophanates and uretdiones of diisocyanates and U.S. Pat. No. 8,389,113, the relevant portions of which are incorporated herein by reference. And polycarbodiimides such as those disclosed in U.S. Pat. Suitable polyisocyanates are well known in the art and are widely commercially available. For example, suitable polyisocyanates are disclosed in US Pat. No. 6,316,119 at column 6, lines 19-36, which is incorporated herein by reference. Examples of commercially available polyisocyanates include DESMODUR VP2078 and DESMODUR N3390 sold by Bayer Corporation and Rhodia Inc. Includes the TOLONATE HDT 90 marketed by

  Suitable aminoplasts include condensates of amines and / or amides with aldehydes. For example, condensates of melamine and formaldehyde are suitable aminoplasts. Suitable aminoplasts are well known in the art. Suitable aminoplasts are disclosed, for example, in US Pat. No. 6,316,119 at column 5, lines 45-55, which is incorporated herein by reference.

  In the preparation of the coatings of the present invention, the branched polyester and the crosslinker can be dissolved or dispersed in a single solvent or mixture of solvents. Any solvent can be used which allows the formulation to be coated on a substrate, which are well known to those skilled in the art. Typical examples include water, organic solvents and / or mixtures thereof. Suitable organic solvents include glycols, glycol ether alcohols, alcohols, ketones and aromatic compounds such as xylene and toluene, acetates, mineral spirits, naphtha and / or mixtures thereof. "Acetate" includes glycol ether acetate. In certain embodiments, the solvent is a non-aqueous solvent. "Non-aqueous solvent" and like terms mean that less than 50% of the solvent is water. For example, less than 10%, or even less than 5% or 2% of the solvent may be water. It is understood that mixtures of solvents that contain or exclude water in amounts of less than 50% can constitute "non-aqueous solvents". In other embodiments, the coating is aqueous or water based. This means that 50% or more of the solvent is water. These embodiments have less than 50%, such as less than 20%, less than 10%, less than 5% or less than 2% solvent.

  In certain embodiments, the coating of the present invention further comprises a curing catalyst. Any curing catalyst commonly used to catalyze the crosslinking reaction between the polyester resin and the crosslinker, such as a phenolic resin, can be used, and there is no particular limitation on this catalyst. Examples of such curing catalysts include dibutyltin dilaurate, phosphoric acid, alkyl aryl sulfonic acids, dodecyl benzene sulfonic acid, dinonyl naphthalene sulfonic acid and di nonyl naphthalene di sulfonic acid.

  It will be appreciated that several factors must be balanced to provide the desired "touch" to the final coating. As mentioned above, the choice and content of monomers can play a role, which may be Mw, equivalent weight and degree of branching. The Tg of the branches can be lowered to enhance the "soft touch" quality of the coating. Furthermore, the choice of crosslinker can also contribute to soft touch. For example, the amount of crosslinker and crosslinker used can be selected to obtain the desired crosslink density related to touch feel as described above. In a particular embodiment, the gloss of the coating at 60 ° is 0.5 to 1.5.

  If desired, the coating composition may comprise other optional materials well known in the art of formulating coatings, such as colorants, plasticizers, abrasion resistant particles, antioxidants, hindered amine light stabilizers, ultraviolet light absorption. Agents and stabilizers, surfactants, flow control agents, thixotropic agents, fillers, organic cosolvents, reactive diluents, catalysts, grinding vehicles, slip agents and other conventional auxiliaries Can.

  The term "colorant" as used herein means any material that imparts color and / or other opacity and / or other visual effects, such as gloss, to the composition. The colorant can be added to the coating in any suitable form, such as discrete particles, dispersions, solutions and / or flakes. A single colorant or a mixture of two or more colorants can be used in the coatings of the present invention.

  Examples of colorants are matting pigments, dyes and tints, for example used in the paint industry and / or listed in the Dry Color Manufacturers Association (DCMA) As well as special effect compositions. The colorant may comprise, for example, a finely divided solid powder which is insoluble but wettable under the conditions of use. The colorant may be organic or inorganic, and may or may not be aggregated. The colorant can be incorporated into the coating by grinding or simply mixing. The colorant can be incorporated into the coating by grinding by using a grinding vehicle such as an acrylic grinding vehicle, the use of which is well known to those skilled in the art.

  Examples of pigments and / or pigment compositions include, but are not limited to, carbazole dioxazine crude pigments, azo, monoazo, disazo, naphthol AS, salt form (lake), benzimidazolones, condensates, metal complexes, iso. Indolinones, isoindolines and polycyclic phthalocyanines, quinacridones, perylenes, perinones, perinones, diketopyrrolopyrroles, thioindigos, anthraquinones, indanthrones, anthrapyrimidines, anthrapyrimidines, flavanthrones, pyranthrones, ansanthrones, dioxazines, triarylcarboniums, quinophthalone pigments, Included are diketopyrrolopyrrole red ("DPPBO red"), titanium dioxide, carbon black, carbon fibers, graphite, other conductive pigments and / or fillers and mixtures thereof. The terms "pigment" and "colored filler" can be used interchangeably.

  Examples of dyes include, but are not limited to, solvents and / or aqueous bases such as acid dyes, azoic dyes, basic dyes, direct dyes, disperse dyes, reactive dyes, solvent dyes, Sulfur dyes, mordant dyes such as bismuth vanadate, anthraquinone, perylene aluminum, quinacridone, thiazole, thiazine, azo, indigoid, nitro, nitroso, oxazine, phthalocyanine, quinoline, stilbene and triphenylmethane are included.

  Examples of tints include, but are not limited to, pigments dispersed in a water-based or water-miscible carrier, such as Degussa, Inc .; Commercially available from AQUA-CHEM 896, Eastman Chemicals, Inc. Commercially available from the Accurate Dispersions division of the company, including CHARISMA COLORANTS and MAXITONER INDUSTRIAL COLORANTS.

  As noted above, the colorant may be in the form of a dispersion including, but not limited to, a nanoparticle dispersion. The nanoparticle dispersion can include one or more highly dispersed nanoparticle colorants and / or colorant particles that provide the desired visible color and / or opacity and / or visual effect. The nanoparticle dispersion may comprise a colorant such as a pigment or dye having a particle size of less than 150 nm, for example less than 70 nm or less than 30 nm. Nanoparticles can be produced by grinding stock organic or inorganic pigments with grinding media having a particle size of less than 0.5 mm. Examples of nanoparticle dispersions and methods of making them are specified in US Pat. No. 6,875,800 B2, which is incorporated herein by reference. Nanoparticle dispersions can also be produced by crystallization, precipitation, vapor phase condensation and chemical attrition (ie partial dissolution). Dispersions of resin-coated nanoparticles can be used to minimize reaggregation of the nanoparticles within the coating. As used herein, "a dispersion of resin-coated nanoparticles" refers to a continuous phase in which discrete "composite microparticles" comprising the nanoparticles and the resin coating on the nanoparticles are dispersed. Examples of dispersions of resin-coated nanoparticles and methods of making them can be found, for example, in US Pat. No. 7,605,194 at column 3, line 56 to column 16, line 25 (this reference Is incorporated herein by reference).

  Examples of special effect compositions that can be used include one or more appearance effects such as reflectance, pearlescent, metallic gloss, phosphorescence, fluorescence, photochromism, photosensitivity, thermochromism, goniochromism and / or color change. The resulting pigment and / or composition is included. Additional special effect compositions can provide other perceptual properties such as opacity or texture. In a non-limiting embodiment, the special effect composition can produce a color shift such that the color of the coating changes when the coating is viewed at different angles. Examples of color effect compositions are specified in US Pat. No. 6,894,086, which is incorporated herein by reference. Additional color effect compositions may be transparent coated mica and / or synthetic mica, coated silica, coated alumina, transparent liquid crystal pigments, liquid crystal coatings, and / or interference to the refractive index difference between the surface of the material and air. It is possible to include any composition not due to but due to refractive index differences within the material.

  In certain non-limiting embodiments, a photosensitive composition and / or photochromic composition, wherein the photosensitive composition and / or photochromic reverses its color when exposed to one or more light sources The composition can be used in the coating of the present invention. Photochromic and / or photosensitive compositions can be activated by exposure to radiation of a specific wavelength. When the composition is excited, the molecular structure changes, and the changed structure exhibits a new color different from the original color of the composition. Once the exposure to radiation is removed, the photochromic and / or photosensitive composition can return to a quiescent state, where the original color of the composition returns. In one non-limiting embodiment, the photochromic and / or photosensitive composition can be colorless in the unexcited state and can exhibit a color in the excited state. A full color change may appear within milliseconds to a few minutes, such as 20 seconds to 60 seconds. Examples of photochromic and / or photosensitive compositions include photochromic dyes.

  In a non-limiting embodiment, the photosensitive composition and / or the photochromic composition may associate with the polymer material of the polymer and / or the polymerizable component and / or be at least partially bound, eg by covalent bonding. it can. Polymers according to non-limiting embodiments of the invention and / or in contrast to some coatings where the photosensitive composition can migrate out of the coating and crystallize into the substrate Photosensitive compositions and / or photochromic compositions associated and / or at least partially associated with the polymerizable component minimize migration out of the coating. Examples of photosensitive compositions and / or photochromic compositions and methods of making them are identified in US Pat. No. 8,153,344, which is incorporated herein by reference.

  In general, the colorant can be present in any amount sufficient to provide the desired visual and / or color effect. The colorant may comprise 1 to 65 weight percent, such as 3 to 40 weight percent or 5 to 35 weight percent of the composition of the present invention in weight percent relative to the total weight of the composition.

  An "abrasion resistant particle" is one that imparts a level of abrasion resistance to the coating when used in the coating as compared to the same coating lacking the particle. Suitable abrasion resistant particles include organic and / or inorganic particles. Examples of suitable organic particles include, but are not limited to, diamond particles such as diamond powder particles and particles formed from carbide materials; examples of carbide particles include, but are not limited to, titanium carbide, Silicon carbide and boron carbide are included. Examples of suitable inorganic particles include, but are not limited to: silica; alumina; alumina silicate; silica alumina; alkali aluminosilicates; borosilicate glass; nitrides including boron nitride and silicon nitride; titanium dioxide and zinc oxide Quartz; nepheline syenite; zircons such as in the form of zirconium oxide; buddeluyite; and eudialite. Particles of any size may be used, and may be a mixture of different particles and / or particles of different sizes. For example, the particles have an average particle size of 0.1 to 50, 0.1 to 20, 1 to 12, 1 to 10, or 3 to 6 microns, or any combination within any range of these ranges. It may be a fine particle. The particles may be nanoparticles having an average particle size of less than 0.1 micron, such as 0.8 to 500, 10 to 100, or 100 to 500 nanometers, or any combination within these ranges.

  Any slip agent such as those commercially available from BYK Chemie or Dow Corning can be used in accordance with the present invention.

  In a particular embodiment, the polyester of the invention is used as a coating additive. For example, it has been discovered that the polyesters of the present invention can replace all or part of a sag control agent such as a cellulose ester used in a coating formulation comprising metal flakes. It is understood that the branched polyester of the invention and the crosslinker therefor can form all or part of the film forming resin of the coating. In certain embodiments, one or more additional film forming resins are also used in the coating. For example, the coating composition can include any of the various thermoplastic and / or thermosetting compositions known in the art. The coating composition may be a water based or solvent based liquid composition or may be in the form of solid particulates, ie a powder coating.

  Thermosetting or curable coating compositions generally comprise a film-forming polymer or resin having functional groups that are either themselves or reactive with the crosslinker. The additional film-forming resin can be chosen, for example, from acrylic polymers, polyester polymers, polyurethane polymers, polyamide polymers, polyether polymers, polysiloxane polymers, their copolymers and mixtures thereof. In general, these polymers may be any of these types of polymers made by any method known to the person skilled in the art. Such polymers may be solvent-borne or water-dispersible, emulsifiable, or water-soluble limited. The functional groups on the film-forming resin are, for example, carboxylic acid groups, amine groups, epoxide groups, hydroxyl groups, thiol groups, carbamate groups, amido groups, urea groups, isocyanate groups (including blocked isocyanate groups) mercaptan groups and the like It can be selected from any of a variety of reactive functional groups including combinations. Suitable mixtures of film forming resins can also be used in the preparation of the coating composition of the present invention.

  The thermosetting coating composition generally comprises a crosslinker which can be selected from any of the crosslinkers described above. In a particular embodiment, the coating of the invention comprises a thermosetting film-forming polymer or resin and a crosslinking agent therefor, wherein the crosslinker is the same as the crosslinker used to crosslink the branched polyester Or different. In certain other embodiments, thermosetting film-forming polymers or resins having functional groups that are reactive with themselves are used. In this approach, such thermosetting coatings are self-crosslinking.

  The coating of the invention may constitute 1 to 100, for example 10 to 90 or 20 to 80,% by weight of the branched polyester of the invention in% by weight relative to the total solid weight of the coating. The coating composition of the invention can also constitute 0 to 90, for example 5 to 60 or 10 to 40% by weight of the crosslinker for the branched polyester in% by weight relative to the total solid weight of the coating. The additional components, if used, can constitute 1% by weight, up to 70% by weight or more by weight based on the total solid weight of the coating.

The coating formulations according to the invention can have a soft touch and / or a smooth feel when cured on a substrate. For example, the coating can have a softness of 1 to ²⁰ N / mm ² , for example ^{2 to} 10 N / mm ² , as measured by Fisher's microhardness test. The coating may further have a coefficient of friction of 0.01 to 0.5, such as 0.05 to 0.2, as measured by ASTM method D1894. The "coefficient of friction" refers to the ratio of the force maintaining contact between the object and the surface to the frictional force resisting movement of the object. Coatings at 50 micron thickness can have 50-500 cycles of abrasion resistance, such as 250-500 cycles, as measured by ASTM method F2357. The cured coating may also have a surface roughness of 1 μm to 80 μm, for example 10 μm to 60 μm, 20 μm to 50 μm or 35 μm to 45 μm, as measured by a Taylor Hobson Precision Duo Profilometer. it can. The surface roughness can be varied by formulation, for example by the use of additives, an example of which is silica. It is understood by those skilled in the art that achieving this level of hardness, coefficient of friction, wear resistance and surface roughness in the same coating is a great achievement. The result is a coating that is soft but durable to touch. The inventors believe that this combination of properties is achieved due to the branching of the polyester, but do not want to be bound by any mechanism.

  In certain embodiments, the prepolymers, branched polyesters and / or coatings of the present invention comprise bisphenol A ("BPA") and bisphenol A diglycidyl ether ("BADGE") and derivatives or residues thereof. May be essentially free, essentially free, and / or completely free. Such prepolymers, branched polyesters and / or coatings may be referred to as "unintentional BPA" because BPA is intentionally added, including derivatives or residues of BPA. It is not because it may be present in minute amounts due to impurities or unavoidable contamination from the environment. Prepolymers, branched polyesters and / or coatings may also be substantially free of bisphenol F and bisphenol F and its derivatives or residues including bisphenol F diglycidyl ether ("BFDGE"), essentially May not be included and / or may not be included entirely. The term "substantially free" as used in this context means that the prepolymer, the branched polyester and / or the coating is 1000 parts per million (any of the compounds, derivatives or residues thereof) "less than ppm) is meant," essentially not included "means less than 100 ppm, and" not completely included "means less than 20 parts per billion (ppb) .

  The coating of the present invention includes, for example, automotive substrates, industrial substrates, packaging substrates, wood floor boards and furniture, apparel, computers, laptops, smartphones, tablets, TVs, game machines, computer devices, computer accessories, Application to any substrate known in the art such as electronics including housings and circuit boards including consumer electronics such as housings for MP3 players etc., glasses and transparencies, sports goods including golf balls can do. These substrates may be metallic or non-metallic, for example. Metallic substrates include tin, steel, tin-plated steel, chromium passivated steel, galvanized steel, aluminum, aluminum foil. Non-metallic substrates include polymer-based, plastic, polyester, polyolefin, polyamide, cellulose-based, polystyrene, polyacrylic, poly (ethylene naphthalate), polypropylene, polyethylene, nylon, EVOH, polylactic acid, and other "green" Polymer substrate, poly (ethylene terephthalate) ("PET"), polycarbonate, polycarbonate acrylobutadiene styrene ("PC / ABS"), polyamide, wood, decorative board, wood composite, particle board, medium density fiber board, cement And stone, glass, paper, cardboard, fabrics, leather (both synthetic and natural) and the like. The substrate may be one that has already been treated in some manner, such as to impart visual and / or color effects.

  The coatings of the present invention can be applied by any means standard in the art such as, for example, electrocoating, spraying, electrostatic spraying, dipping, rolling, brushing and the like.

  The coating can be applied at a dry film thickness of 0.04 mils to 4 mils, such as 0.3 to 2 mils or 0.7 to 1.3 mils. In other embodiments, the coating is 0.1 mil or greater than 0.1 mil, 0.5 mil or greater than 0.5 mil, 1.0 mil or greater than 1.0 mil, 2.0 mil or 2.0 mil It can be applied with dry film thickness of over mill, 5.0 mil or 5.0 mil or more. The coatings of the present invention can be used alone or in combination with one or more other coatings. For example, the coatings of the present invention may or may not contain a colorant and may be used as primers, base coats and / or top coats. For substrates coated with multiple coatings, one or more of those coatings may be a coating as described herein. The coatings of the present invention can also be used as packaging "size" coatings, washcoats, spray coats, end coats, and the like.

  It is understood that the coatings described herein may be one component ("1 K") or multi-component compositions such as two components ("2 K") or more than two components. A 1 K composition is understood to refer to a composition in which all coating components are maintained in the same container after manufacture, during storage and the like. The 1K coating is applied to the substrate and can be cured by any conventional means such as, for example, heating, forced air, and the like. The coating of the present invention may be a multi-component coating, understood as a coating in which the various components are kept separate until just before application. As mentioned above, the coatings of the present invention may be thermoplastic or thermosetting.

  In certain embodiments, the coating is a clear coat. Clearcoat is understood as a coating that is substantially transparent or translucent. Thus, the clearcoat can have some color, opacity, but it does not opacify the clearcoat or otherwise to any significant extent the ability to see the underlying substrate There is a condition that it has no effect. The clearcoats of the invention can be used, for example, in conjunction with a pigmented basecoat. The clear coat can be formulated in the same manner as known in the coating art.

  In certain other embodiments, the coating, such as, for example, a pigmented basecoat used in conjunction with a clearcoat or as a pigmented monocoat, comprises a colorant. Such coating layers are used, for example, in the automotive industry to impart a decorative and / or protective finish to vehicles. "Vehicle" is used herein in its broadest sense, for example, all types of vehicles including, but not limited to, cars, trucks, buses, vans, golf carts, motorcycles, bicycles, freight cars, etc. Including. It is understood that the portion of the vehicle coated by the present invention may vary depending on why the coating is used. For example, a chip resistant primer can be applied to part of a portion of a vehicle as described above. The coatings of the present invention, when used as a pigmented basecoat or monocoat, will generally be applied to such parts of the visible vehicle such as the roof, hood, lid of a door trunk, etc. It can also be applied to other areas, such as the inside. They can also be applied to those parts of the car that come in contact with the driver and / or the passenger, for example the steering wheel, dashboard, gearshift, control system, door handle etc. The clear coat will generally be applied to the outside of the vehicle.

  In another embodiment, the present invention is directed to a substrate coated at least in part with a coating of the present invention, the substrate comprising consumer electronics components. The “consumer electronic parts” includes, for example, any part or housing such as a computer, a laptop, a smartphone, a tablet, a television, a game console, a computer accessory, an MP3 player and the like. The coating is applied to at least the outside of the housing of such a device, but can also be applied to the inside of such a housing, in whole or in part. The coatings of the present invention are particularly suitable for application to consumer electronics because they can provide the desired soft touch and durability.

  Coil coatings, which have broad applications in many industries, are also substrates that can be coated according to the present invention. As discussed above, due to their unique combination of flexibility and hardness, the coatings of the present invention are particularly suitable as coil coatings. Coil coatings also generally contain a colorant.

  The coatings of the present invention are also suitable for use as packaging coatings. The application of various pretreatments and coatings to packaging is well established. Such treatments and / or coatings may be used, for example, in the case of metal cans, where the treatments and / or coatings are manufactured to provide a decorative coating to retard or inhibit corrosion. Used to provide ease of handling during the process, etc. On the inside of such a can, a coating can be applied to prevent its contents from contacting the metal of the container. For example, contact of metal with food or drink results in corrosion of the metal container, which can then contaminate the food or drink. This is especially true if the contents of the can are acidic in nature. The coating applied to the inside of the metal can also helps to prevent corrosion in the upper space of the can, the area between the fill line of the product and the can lid. Corrosion in the headspace is a particular problem with foodstuffs having high salt content. The coating can also be applied to the outside of the metal can. Particular coatings of the present invention are in particular coiled metal stock (e.g. coiled metal stock from which the end of the can is made ("can end stock"), and It can be applied to applications using what the end caps and closures are made of ("cap / closure material")). Coatings designed for use on can end material and cap / closure materials are generally cut away from the coiled metal material and applied prior to punching so that the coating is generally flexible Sexual and extensible. For example, such materials are generally coated on both sides. Thereafter, a hole is made in the coated metal material. For the can end, the metal is then scored for a "pop-top" opening and then the pull-up ring is attached with a separately machined pin. This end is then attached to the can body by an edge rolling process. The same procedure is followed for "easy open" can ends. Because of the easy open end of the can, the notches substantially around the periphery of the lid generally allow the lid to be easily released or removed from the can by means of a pull tab. For caps and closures, the cap / closure material is generally coated, such as by roll coating, and the cap or closure is punched from the material. However, the cap / closure can be coated after formation. Coatings for cans that are exposed to relatively stringent temperature and / or pressure requirements must also be resistant to popping, corrosion, fogging and / or blistering.

  Thus, the present invention is further directed to a packaging material coated at least in part with any of the above coating compositions. In a particular embodiment, the packaging material is a metal can. The term "metal can" includes any type of metal can, container or any type of receptacle or portion thereof used to hold something. An example of a metal can is a food can. The term "food can" as used herein refers to a can, a container or any type of receptacle or portion thereof used to hold any type of food and / or drink. Metal "bottles" that mimic the shape of glass bottles are also "metal cans" according to the present invention. The term "metal can" includes in particular food cans, and in particular also "can ends", which are usually punched out of the can end stock and are used in conjunction with beverage packaging. The term "metal can" in particular also includes metal caps and / or closures, such as bottle caps of any size, screw cap caps and lids, lug caps etc. Metal cans are other items and food and / or beverages including, but not limited to, personal care products, insect sprays, spray paints, and any other compounds suitable for packaging in aerosol cans. Can be used to hold Cans can include "two-piece cans" and "three-piece cans" as well as drawn and ironed one-piece cans; such one-piece cans can often find use with aerosol products. Packaging materials coated according to the present invention can also include plastic bottles, plastic tubes, laminates and flexible packaging materials such as those made of PE, PP, PET, and the like. Such packaging can hold, for example, food, toothpaste, personal care products, and the like.

  This coating can be applied to the inside and / or the outside of the packaging material. For example, the coating can be roll coated onto the metal used to make a two-piece food can, a three-piece food can, a can end blank and / or a cap / closure blank. In some embodiments, the coating is applied on the coil or sheet by roll coating. The coating is then cured by radiation, the can end stamped out and processed into a finished product, ie the can end. In another embodiment, the coating is applied as a rim coat to the bottom of the can. Such application may be by roll coating. The rim coat functions to reduce friction to improve handling during can and continuous processing and / or processing. In certain embodiments, the coating is applied to the cap and / or the closure. Such an application may, for example, be a protective varnish applied before and / or after the formation of the cap / closure, and / or a colored enamel after being applied to the cap, in particular a scored seam at the bottom of the cap. Can be included. The decorated can stock can also be partially coated from the outside with the coating described herein, and the decorated and coated can stock is used to form various metal cans.

  The substrate to be coated according to the present invention can be coated with any of the above compositions by any means known in the art such as spraying, rolling, dipping, brushing, flow coating and the like. This coating can also be applied by electrocoating if the substrate is conductive. Based on the type of substrate to be coated and the function with which the coating is used, the person skilled in the art can determine the appropriate application means. The coating can be applied on the substrate as a single layer, or, if desired, as multiple layers with multiple heating steps between the application of each layer. After application to a substrate, the coating composition can be cured by any suitable means.

  As used herein, and unless otherwise explicitly stated, all numbers, such as those representing values, ranges, amounts or percentages, are taken to mean that the term "about" is not explicitly stated. , Can be read as if the word "about" is placed in front of it. Also, any numerical range recited herein is intended to include all sub-ranges incorporated therein. The singular shall include the plural and vice versa. For example, as used herein, “one (a)” polyester, “one (a)” branched polyester, “an” unsaturated acid / anhydride / ester, “one (a)” Polyol prepolymer, "one (a)" soft segment, "one (a)" soft monomer, "one (a)" polyol segment, "one (a)" polyol segment monomer, "one (a) Reference has been made to “prepolymers”, “one (a)” crosslinkers, etc., although one or more of each of these and any other components may be used. The term "polymer" as used herein refers to oligomers as well as both homopolymers and copolymers, and the prefix "poly" refers to two or more. For example, including and similar terms mean, for example, including but not limited to certain things. Where ranges are given, any endpoints of those ranges and / or numbers within those ranges may be combined within the scope of the present invention.

  The following examples are intended to illustrate the invention and should not be construed as limiting the invention in any way.

  The hardness was measured with an HM2000S Fischer microhardness measuring device according to the instruction manual described in the Fischerscope HM2000 manual. Three measurements were taken and the average hardness value was recorded and reported.

  The coefficient of friction test was performed using a Dynisco 1055 coefficient of friction tester, Chatillion DGGS force gauge and a green felt thread. Five tests were performed on each sample. Five measurements were performed and the average hardness value was recorded and reported.

  Surface roughness was measured with a Taylor Hobson Precision Surtronic Duo Roughness Machine according to the instructions provided by the manufacturer.

Wear resistance was measured according to ASTM method F2357.
Example 1

  Branched polyesters according to the invention were prepared as follows. Distillation head at the top of a stirrer with 650 g 2-methyl-1,3-propanediol, 177 g adipic acid, 287 g isophthalic acid, 179 g phthalic anhydride, 223 g maleic anhydride and 1.5 g butyl stannic acid The solution was added to a 3 liter, 4-neck round bottom flask equipped with a steam cooled column with a thermocouple and a thermocouple. The contents were gradually heated under a stream of nitrogen gas. The contents of the flask were heated to about 95 ° C. At that point they melted and started stirring. The batch was heated to 155 ° C. At that point, water began to distill. Heating was continued to a batch temperature of 220 ° C. 160 g of water were removed by the reaction. The final acid number of the resin was determined to be 3.8. The contents of the batch were cooled to 150 ° C. and 316 g of Aromatic 100 was added. The material in the flask was then cooled and poured out. The solids content was 81% by weight. The OH number of the resin was 50.2 at 81% solids. The weight average molecular weight of the product was 5700 relative to the polystyrene control. The Tg of the prepolymer was -11 ° C.

988 g of the above resin was placed in a 3 liter, 4 neck round bottom flask equipped with a stirrer, a water condenser, an addition funnel and a thermocouple. The contents of the flask were heated to 120 ° C. 2 g of tert-butyl peroctoate and 153 g of butyl acetate were mixed and placed in an addition funnel. The contents of the funnel were added to the flask over 10 minutes. The temperature of the reaction was maintained at 120 ° C. for 1 hour. It was then cooled and the contents poured out. The final resin had a solids content of 70% by weight. The OH number of the resin was 41 at 70% solids. It had a weight average molecular weight of 7900, as measured against polystyrene standards. The Tg of the polyester was -18 ° C as measured by dynamic scanning calorimetry.
(Example 2)

  Branched polyesters according to the invention were prepared as follows. Distillation head at the top of a stirrer with 650 g of 2-methyl-1,3-propanediol, 282 g of adipic acid, 166 g of isophthalic acid, 179 g of phthalic acid, 223 g of maleic anhydride and 1.5 g of butyl stannic acid The solution was added to a 3 liter, 4-neck round bottom flask equipped with a steam cooled column with a thermocouple and a thermocouple. The contents were gradually heated under a stream of nitrogen gas. The contents of the flask were heated to about 95 ° C. at which point they melted and started stirring. The batch was heated to 155 ° C., at which point water began to distill. Heating was continued to a batch temperature of 220 ° C. 162 g of water were removed by the reaction. The final acid number of the resin was determined to be 6.1. The contents of the batch were cooled to 150 ° C. and 313 g of Aromatic 100 was added. The material in the flask was then cooled and poured out. The solids content was 81% by weight. The OH number of the resin was 43 at 81% solids. The weight average molecular weight of the product was 6600 relative to the polystyrene control, and the Tg of the prepolymer was -18 ° C.

988 g of the above resin was placed in a 3 liter, 4 neck round bottom flask equipped with a stirrer, a water condenser, an addition funnel and a thermocouple. The contents of the flask were heated to 120 ° C. 2 g of tert-butyl peroctoate and 153 g of butyl acetate were mixed and placed in an addition funnel. The contents of the funnel were added to the flask over 10 minutes. The temperature of the reaction was maintained at 120 ° C. for 1 hour. It was then cooled and the contents poured out. The final resin had a solids content of 71% by weight. The OH number of the resin was 32 at 71% solids. It had a weight average molecular weight of 9300 as measured against polystyrene standards. The Tg of the polyester was -22 ° C as measured by dynamic scanning calorimetry.
(Example 3)

  Branched polyesters according to the invention were prepared as follows. 650 g of 2-methyl-1,3-propanediol, 711 g of adipic acid, 152 g of maleic anhydride and 1.5 g of butyl stannic acid, equipped with a stirrer, a vapor-cooled column with a distillation head at the top and a thermocouple Add to 3 liter 4 neck round bottom flask. The contents were gradually heated under a stream of nitrogen gas. The contents of the flask were heated to about 112 ° C. at which point they melted and started stirring. The batch was heated to 173 ° C., at which point water began to distill. Heating was continued to a batch temperature of 220 ° C. A total of 196 g of water was removed by the reaction. The final acid number of the resin was determined to be 2.6. The contents of the batch were cooled to 150 ° C. and 307 g of Aromatic 100 was added. The material in the flask was then cooled and poured out. The solids content was 81% by weight. The OH number of the resin was found to be 52 at 81% solids. The weight average molecular weight of the product was found to be 5700 relative to a polystyrene control. The Tg of the prepolymer was -47 ° C.

982 g of the above resin was placed in a 3 liter, 4-neck round bottom flask equipped with a stirrer, a water-cooled condenser, an addition funnel and a thermocouple. The contents of the flask were heated to 120 ° C. 2 g of tert-butyl peroctoate and 158 g of butyl acetate were mixed and placed in an addition funnel. The contents of the funnel were added to the flask over 10 minutes. The temperature of the reaction was maintained at 120 ° C. for 1 hour. It was then cooled and the contents poured out. The final resin had a solids content of 71% by weight. The OH number of the resin was found to be 50 at 71% solids. It has a weight average molecular weight of 6700 as measured relative to polystyrene standards and has a Tg of -48 ° C.
(Example 4)

A coating according to the invention was prepared as follows. 59 g of polyester resin from Example 1, 17 g of ethyl acetate, 5 g of diacetone alcohol, 5 g of PM acetate and 0.4 g of DISPERBYK-103 (wet and disperse additive commercially available from BYK), overhead machine Add to a half pint metal can equipped with a mechanical stirrer. The above mixture was mixed gently for 5 to 10 minutes, after which 6.5 g of ACEMATT TS-100 silica (a thermal silica available from Evonik Industries) was added. The mixture was kept mixing at high speed for 20-30 minutes. A total of 1 gram of SILOK-3200 (coating feeling agent commercially available from Guangzhou Silok Polymers Co., Ltd., 0.6 g of BLS 292 (light stabilizer from Mayzo, Inc.) and 0. 1 g of dibutyltin dilaurate was finally added to the metal can and mixed for an additional 5 minutes The resulting mixture was 21 g of XPH 8000 hardener (HDI trimer (commercially available from PPG Industries, Inc.)). And diluted with GXS 73037 reducer (organic solvent mixture available from PPG Industries, Inc.) to an appropriate spray viscosity.The resulting soft touch paint is polycarbonate based. Sprayed on, at a dry film build of about 50 [mu] m, and cured at 60 ° C. 30 min. The final soft touch coating on a polycarbonate substrate, the hardness of 4.2 N / mm ^2, the friction coefficient of 0.06, 42 The surface roughness and abrasion resistance of 480 cycles were tested This coating was tested for stain resistance to common household items, stain resistant to mustard, ketchup, lipstick, sunscreen, vaseline and hand lotion Showed sex.
(Example 5)

A coating according to the invention was prepared as follows. 59 g of polyester resin from Example 2, 17 g of ethyl acetate, 5 g of diacetone alcohol, 5 g of PM acetate and 0.4 g of DISPERBYK-103 were added to a half pint metal can equipped with an overhead mechanical stirrer . The above mixture was mixed gently for 5 to 10 minutes, after which 6.5 g of ACEMATT TS-100 silica was added. The mixture was kept mixing at high speed for 20-30 minutes. A total of 1 gram of SILOK-3200, 0.6 g of BLS 292 and 0.1 g of dibutyltin dilaurate was finally added to the metal can and mixed for an additional 5 minutes. The resulting mixture was mixed with 16 g of XPH 80002 hardener and diluted with GXS 73037 wash liquor to an appropriate spray viscosity. The resulting soft touch paint was sprayed onto a polycarbonate substrate and cured at 60 ° C. for 30 minutes to build up a dry film of approximately 55 μm. The final soft touch coating on the polycarbonate substrate exhibited a hardness of 3.3 N / mm ^2, a coefficient of friction of 0.07, a surface roughness of 44 and an abrasion resistance of 300 cycles. This coating was tested for stain resistance to common household items and showed stain resistance to ketchup, lipstick, sunscreen, vaseline and hand lotion, but some stains occurred on mustard.
(Example 6)

A coating according to the invention was prepared as follows. 59 g of polyester resin from Example 3, 17 g of ethyl acetate, 5 g of diacetone alcohol, 5 g of PM acetate and 0.4 g of DISPERBYK-103 were added to a half pint metal can equipped with an overhead mechanical stirrer . The above mixture was mixed gently for 5 to 10 minutes, after which 6.5 g of ACEMATT TS-100 silica was added. The mixture was kept mixing at high speed for 20-30 minutes. A total of 1 gram of SILOK-3200, 0.6 g of BLS 292 and 0.1 g of dibutyltin dilaurate was finally added to the metal can and mixed for an additional 5 minutes. The resulting mixture was mixed with 26 g of XPH 80002 hardener and diluted with GXS 73037 wash liquor to an appropriate spray viscosity. The resulting soft touch paint was sprayed onto a polycarbonate substrate and cured at 60 ° C. for 30 minutes to build up a dry film of approximately 55 μm. The final soft touch coating on the polycarbonate substrate has a hardness of 3.0 N / mm ^2, a coefficient of friction of 0.07, a surface roughness of 38 and a 350 cycle, measured after initial cure and 600 cycles after 5 days. Showed the wear resistance of This coating was tested for stain resistance to common household items and showed stain resistance to ketchup, sunscreen, vaseline and hand lotion, but some stains occurred with mustard and lipstick.

Claims (18)

A crosslinkable branched polyester polymer prepared by free radical polymerization of the double bonds of the first unsaturated polyester prepolymer and the double bonds of the second unsaturated polyester prepolymer, wherein each prepolymer is independently ,
a) Polyol segment,
b) containing unsaturated polycarboxylic acids and / or their anhydrides and / or esters;
Here, the branched polyester polymer have a Tg or below Tg of 25 ° C.,
Here, the polyester of _{M W} is 4,000 to 10,000,
Crosslinkable branched polyester polymers. The crosslinkable branched polyester polymer of claim 1, wherein the prepolymer further comprises a soft segment. A crosslinkable branched polyester polymer according to claim 2, wherein the soft segment comprises adipic acid. The crosslinkable branched polyester polymer of claim 1, wherein the prepolymer further comprises isophthalic acid. The crosslinkable branched polyester polymer of claim 1, wherein the polyol segment comprises 2-methyl-1,3-propanediol. The crosslinkable branched polyester polymer according to claim 1, wherein the unsaturated polycarboxylic acid / anhydride / ester comprises maleic acid / anhydride / ester and / or itaconic acid / anhydride / ester. The crosslinkable branched polyester polymer according to claim 2, wherein at least one prepolymer comprises adipic acid, 2-methyl-1,3-propanediol and maleic acid / anhydride / ester. A coating comprising the crosslinkable branched polyester polymer of claim 1 and a crosslinker therefor. A hardness of ² to 10 N / mm ² as measured by the Fisher microhardness test, a coefficient of friction of 0.05 to 0.2 as measured by ASTM method D1894, 250 to 500 cycles as measured by ASTM method F2357 9. The coating according to claim 8 , having a surface roughness of 20 [mu] m to 50 [mu] m, as measured by abrasion resistance and / or Taylor Hobson precision certronic duo roughness tester. 9. The coating of claim 8 , wherein at least one of the prepolymers comprises adipic acid, 2-methyl-1,3-propanediol and maleic acid / anhydride / ester. 9. The coating of claim 8 , further comprising a colorant. 9. The coating of claim 8 , wherein the crosslinker comprises an isocyanate. A substrate coated at least in part with the coating of claim 8 . The substrate of claim 13 comprising a consumer electronics component. The substrate of claim 13 comprising PC / ABS. The substrate according to claim 13 , comprising a metal can. The crosslinking nature branched polyester polymer does not include a (meth) acrylate or residue thereof, crosslinked nature branched polyester polymer according to claim 1. A crosslinkable branched polyester polymer according to claim 1, wherein the only unsaturation in the prepolymer is from component b).