JPWO2015188947A5 - - Google Patents

Description

The solution to the above technical problems is achieved by providing embodiments characterized in the claims. In particular, the present invention is a method for producing an HMA mass having a coating, wherein the coating has a non-adhesive property up to 50 ° C., and the above method exists as a coating material existing in a liquid form or a melt form in a solid form. It comprises the step of at least partially applying to the surface of the HMA mass, the coating material to be applied being on the surface of the HMA mass within 60 seconds, preferably within 30 seconds, but at least 0.1 seconds or more, eg. Provided is a method of solidifying and fixing in 0.1 to 30 seconds to form a coating. According to the present invention, the terms "HMA mass", "HMA material" and "HMA formulation" each preferably preferably include the HMPSA group, i.e., in a preferred embodiment, the "HMA mass" as used herein. Alternatively, the term "HMA material" or "HMA formulation" can be replaced with the term "HMPSA mass" or "HMPSA material" or "HMPSA formulation". Moreover, the terms "non-adhesive" and "non-adhesive property" up to a certain temperature (T) usually come into contact (packaging, operator's hands, etc.) below the temperature (T) at which the material is mentioned. It means that it does not adhere to the surface. In general, the above properties can be evaluated by placing the material in a cardboard box in which the blocks of HMA having a coating are in contact with each other. Close the box and place in the oven at the temperature mentioned for 1 week. The box is then removed from the oven and equilibrated at room temperature. The coating is then evaluated as non-adhesive if each block of coated HMA can be easily removed individually by hand without sticking to adjacent blocks, protective paper or operator's hands. ..

The coating material has non-adhesive properties up to 50 ° C., wax or its derivatives, ethylene-based (co) polymers, polyolefins, polyvinyl acetate and its copolymers, poly (meth) acrylates, polyesters, polyvinyl alcohols, polyurethanes, vinyls. It may include one of a plurality of components selected from the group consisting of copolymers of monomers and polyalkylene oxides, elastomer block copolymers, and blends or mixtures thereof. Further, the coating material may contain, as any component / component, one or more components / components selected from the group consisting of plasticizers, stabilizers and antioxidants. The coating material is not limited in principle up to 50 ° C. when present as a coating, except for the non-adhesive properties described above, but when the end user / customer melts the HMA mass having the coating for further application of the HMA ( It may be preferred to choose so as not to adversely affect (ie, significant adverse effects) the properties (predicted). The coating material can be applied by any method known in the art, such as spray coating, curtain coating or dip coating, and spray coating is preferred. In the dip coating, the period for dipping the HMA mass is preferably within a period of 0.1 to 30 seconds. After the coating material is applied to the surface of the HMA mass, the formation of the coating can be promoted by rapidly heating it arbitrarily, for example, for 0.1 second to 10 seconds, preferably at a temperature of 150 ° C. to 250 ° C. Further, the applied coating can be cooled to room temperature (about 25 ° C.) to obtain an HMA mass having the coating, for example ready to use.

The coating material used in the method of the present invention may be any thermoplastic material, but shall have non-adhesive properties up to 50 ° C. The coating material is preferably a hot melt material. The coating material is determined by ASTM E-28, a petroleum wax such as paraffin wax having a melting point of about 54 ° C. to 85 ° C. and microcrystalline wax having a melting point of about 54 ° C. to 95 ° C. (the latter melting point is determined by the DSC method). Carbon monoxide such as atactic polypropylene having a ring-shaped softening point of about 120 ° C. to 160 ° C., a propylene-based wax of a metallocene catalyst, a wax of a metallocene catalyst or a wax of a single-site catalyst, and Fisher-Tropsch wax is polymerized with hydrogen. It can be selected from waxes and derivatives thereof, including synthetic waxes thus produced, as well as polyolefin waxes. Each of these waxes is solid at room temperature. Other useful substances / ingredients include, but are not limited to, hydrogenated animal, fish, which are referred to in the adhesive industry as "animal wax or vegetable wax". There are sex and vegetable fats and oils such as hydrogenated tallow, lard, soybean oil, cottonseed oil, castor oil, Menhaden oil, cod liver oil and the like, which are solid at ambient temperature because they are hydrogenated. They have also been found to be useful because they function in the same way as wax materials. Among the useful partially crystalline ethylene polymers, LDPE, VLDPE, LLDPE, MDPE obtained by Ziegler-Natta catalytic polymerization, or LDPE, EVA, EAA, EMA, EBA, EE2HA obtained by vapor phase random polymerization, Alternatively, reference can be made to EO, EP, EB, EH, ESI copolymers obtained by Ziegler-Natta catalytic polymerization or single site catalytic polymerization or metallocene catalytic polymerization. In addition, other ethylene copolymers such as ethylene methacrylate, ethylene n-butyl acrylate and ethylene acrylate polymers; polyolefins such as polyethylene, polypropylene and copolymers, amorphous poly-α-olefin (APAO); polyvinyl acetate and copolymers. References to poly (meth) acrylates derived from various acrylic monomers, such as alkyl (meth) acrylates, hydroxyalkyl (meth) acrylates, acrylamides; polyesters; polyvinyl alcohols; polyurethanes; copolymers of vinyl monomers and polyalkylene oxides. Can be done. Other useful materials include elastomer block copolymers containing SB, SI, SBS, SIS, SEBS, SEPS and SEP. Useful elastomers are elastomer copolymers of ethylene and propylene, or such copolymers modified with functional monomers. Examples include EPR rubber, EPDM rubber and / or blends of EPR and EPDM. The functional monomer contains one or more functional groups including a carboxylic acid group, an anhydride group, a hydroxyl group, an ether group, a primary, secondary and tertiary amine group, and an ester group. A group of saturated organic compounds can be mentioned.

Claims (9)

A method of making a hot melt adhesive (HMPSA) with a coating, the coating having non-adhesive properties up to 50 ° C., the method of pelletizing HMPSA and obtaining HMPSA granules in a mold hole. The step of obtaining a block of HMPSA grains by molding with or without pressure, and the coating material present in liquid or molten form at least partially on the surface of the block of HMPSA grains present in solid form. The coating material to be applied is a method of solidifying and fixing on the surface of a block of HMPSA grains within 60 seconds to form a coating.
A method in which the surface temperature of the block of HMPSA grains is in the range of −20 ° C. to 40 ° C. in the step of applying the coating material. The method according to claim 1, wherein the DSC melting point or softening point (ASTM E 28) of the coating material exceeds 50 ° C. The HMPSA is polyester, poly (meth) acrylate, polyolefin, polyurethane, ethylene-based (co) polymer, polyvinyl acetate and copolymers thereof, copolymers of vinyl monomers and polyalkylene oxides, styrene block copolymers, and blends or mixtures thereof. Consists of one or more components selected from the group consisting of, optionally tack-imparting resins, plasticizers, waxes, antioxidants, stabilizers, adhesion promoters, fillers, pigments, dyes, oils and fragrances. The method of claim 1 or 2, comprising one or more components selected from the group. The coating is wax or a derivative thereof, ethylene-based (co) polymer, polyolefin, polyvinyl acetate and its copolymer, poly (meth) acrylate, polyester, polyvinyl alcohol, polyurethane, copolymer of vinyl monomer and polyalkylene oxide, and One or more components selected from the group consisting of elastomer block copolymers and blends or mixtures thereof, and optionally one or more components selected from the group consisting of plasticizers, stabilizers and antioxidants. The method according to any one of claims 1 to 3, which comprises an element. The method according to any one of claims 1 to 4, wherein the coating does not adversely affect the characteristics of the HMPSA even if the HMPSA having the coating melts. The method according to any one of claims 1 to 5, wherein the coating material is applied by a spray coating, a curtain coating, a dip coating, or a combination thereof. The method of claim 6, wherein the dip coating is performed within a period of 0.1 to 30 seconds. In the step of obtaining a block of HMPSA grains before the step of applying the coating material, the following steps are further:
The step of drying the HMPSA existing in the pelletized form and / or the molded form by evaporation and / or heating, and
Optionally, a step of fixing the shape of the HMPSA present in pelletized and / or molded and / or dried forms by applying pressure.
The method according to any one of claims 1 to 7, comprising the method according to any one of claims 1 to 7. HMPSA with a coating, the coating having non-adhesive properties up to 50 ° C., the HMPSA being a block of HMPSA grains.