Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L45/00—Compositions of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Compositions of derivatives of such polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/10—Esters; Ether-esters
  • C08K5/101—Esters; Ether-esters of monocarboxylic acids
  • C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F232/00—Copolymers of cyclic compounds containing no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic ring system

Definitions

• COC cycloolefin copolymer
• Resins comprising one or more cycloolefin copolymers have been disclosed for use in a variety of optical applications, including, for example, optical or compact disks, information recording films and base boards, optical fibers, and the like.
• U.S. Patent No. 5,439,722 discloses a cycloolefin copolymer comprising at least one cycloolefin copolymer for recording media, wherein the cycloolefin copolymer has a molar-mass distribution M w /M n ⁇ about 2, a molecular weight of less than/equal to about 30,000 g/mole and a glass transition temperature of from about 100°C to 200°C. Also disclosed in U.S. Patent No. 5,439,722 are blends of two or more COCs.
• compositions for use in information recording films and information recording baseboards are disclosed in U.S. Patent No. 4,874,808. More particularly, the patent discloses compositions comprising (A) a cycloolefin type random copolymer containing an ethylene component and a cycloolefin component represented by the general formula
• R 1 to R 10 each represent a hydrogen atom, halogen atom or hydrocarbon group, wherein said cycloolefin type random copolymer (A) has an intrinsic viscosity of 0.05 - 10 dl/g as measured at 135°C in decalin and a softening temperature of not lower than 70°C and (B) a cycloolefin type random copolymer containing an ethylene component and a cycloolefin component represented by either of the aforesaid general formulas, wherein said cycloolefin type random copolymer (B) has an intrinsic viscosity of 0.01-5 dl/g as measured at 135°C in decalin and a softening temperature of below 70°C, wherein the weight ratio of component (A) to component (B) ranges from 100/0.1 to 100/10.
• component (A) and component (B) are disclosed as providing compositions having improved adhesion.
• the patent also discloses that, in addition to the cycloolefin type random copolymer (A) and the cycloolefin type random copolymer (B), the composition may contain stabilizers such as phenolic antioxidants, metallic salts of fatty acids, and fatty esters of polyhydric alcohols.
• stabilizers such as phenolic antioxidants, metallic salts of fatty acids, and fatty esters of polyhydric alcohols.
• phenolic antioxidants as illustrated above are used in an amount of 0.01-10 parts by weight, preferably 0.05-3 parts by weight based on 100 parts by weight of the cycloolefin type random copolymer composition.
• the fatty esters of polyhydric alcohol are used in an amount of 0.01-10 parts by weight, preferably 0.05-3 parts by weight based on 100 parts by weight of the said compositions.
• U.S. Patent No. 4,874,808 specifically exemplifies compositions containing a cycloolefin copolymer (A) having a softening temperature ranging from 153°C to 155°C, a cycloolefin copolymer (B) having a softening temperature ranging from 39°C to 45°C), 0.5% of tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] methane (a phenolic antioxidant), 0.05% of zinc stearate and 0.5% of glycerin monostearate, said amounts of phenolic antioxidant, zinc stearate, and glycerin monostearate being based on the total weight of the COC components (A) and (B).
• U.S. Patent No. 4,874,808 further exemplifies compositions containing a single cycloolefin type random copolymer, 0.05 % by weight of zinc stearate, 0.6 % by weight of a phenolic antioxidant, and 0.6 to 9.6% by weight of a fatty ester of a polyhydric alcohol, which was either partially esterified, as in the case of Examples 16 to 18, or completely esterified, as in the case of Example 21.
• Example 19 of the patent exemplifies a composition containing a single cycloolefin type random copolymer, 0.6% by weight of a phenolic antioxidant and 0.05% by weight of zinc stearate;
• Example 22 exemplifies a composition containing a single cycloolefin type random copolymer, a partially esterified fatty ester of a polyhydric alcohol and zinc stearate. Molded specimens made from the compositions containing the single cycloolefin type random copolymer were evaluated for properties that included color hue (b value) and the formation of silver streaks.
• specimens made from the compositions that contained the phenolic antioxidant, a partially esterified fatty ester of a polyhydric alcohol and zinc stearate exhibited less silver streaking and yellowing, as a function of the color hue value "b", than specimens made from the compositions which lacked the antioxidant (i.e., the composition of Example 22) or specimens made from the compositions which lacked the fatty acid ester of the polyhydric alcohol (i.e., the composition of Example 19) or specimens that contained a completely esterified fatty acid ester of a polyhydric alcohol (i.e., the composition of Example 21 ).
• specimens made from the compositions of Examples 16 to 18 had color hue (b values) ranging from 1.0 to 1.2; in contrast, specimens made from the compositions of Examples 19, 21 and 22 had b values ranging from 3.0 to 5.0.
• a cycloolefin copolymer resin comprising a first cycloolefin copolymer having a glass transition temperature (T g ) of from about 100°C to about 220°C, may be reduced by incorporating therein a fatty acid ester of a polyhydric alcohol and up to about 10% by weight of a second cycloolefin copolymer having a T g greater than about 50°C, but at least about 25°C lower than that of the first cycloolefin copolymer.
• the resulting resin is also found to have reduced silver streaking (also termed splaying) and haze.
• this invention relates to a cycloolefin copolymer resin having a Hunter b color value of less than 1.0, which resin comprises:
• cycloolefin copolymers used in the practice of the subject invention are random copolymers comprising units derived from (a) at least one cycloolefin selected from the group consisting of :
• R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 are independently selected from hydrogen, Ci to C 20 alkyl groups, C 6 to C 20 aryl groups, F, CI, Br, and I, and n is an integer having a value from 0 to 5 ; (b) an non cyclic 1-olefin of the formula:
• R 9 to R 12 are independently selected from hydrogen and Ci to C 8 alkyl groups; and, optionally, (c) a cycloolefin of the formula:
• cycloolefin copolymer comprising units derived from ethylene and a formula I cycloolefin are of particular interest.
• the first cycloolefin copolymer has a glass transition temperature of from about 100°C to about 220°C, with copolymers having glass transition temperatures of from about 100°C to about 185°C, more particularly from about 100°C to about 160°C, being of special interest owing to their ability to be processed at relatively low temperatures.
• the molar-mass destribution (M w /M n ) of the first cycloolefin copolymer is less than 2.
• the second cycloolefin copolymer should have a glass transition temperature of greater than about 50°C, with the proviso that the glass temperature of the second cycloolefin copolymer is at least 25°C lower than the glass transition temperature of the first cycloolefin copolymer.
• the second cycloolefin copolymer a copolymer having a glass transition temperature of from about 55°C to about 85°C, more particularly, from about 55°C to about 70°C; however copolymers having higher glass transition temperatures can be employed as the second cycloolefin copolymer when the first cycloolefin copolymer has a higher glass transition temperature, for example, a glass transition temperature in excess of 185°C, and higher use temperatures are desired.
• a glass transition temperature for example, a glass transition temperature in excess of 185°C, and higher use temperatures are desired.
• cycloolefin copolymers The preparation of cycloolefin copolymers is well known in the art and is described, for example, in U.S. Patent Nos. 4,874,808 and 5,439,722, the disclosures of which are incorporated herein by reference.
• the cycloolefin copolymers may be produced at temperatures from -78°C to 200°C and pressures from 0.01 to 200 bar with one or more catalyst systems which contain at least one transition metal compound and, if necessary, a co-catalyst and, if necessary, a substrate material. Metallocenes are well suited for use as such transition metal compounds.
• Cycloolefin copolymers and catalyst systems, which may used in the preparation thereof are described, for example, in US Pat. Nos. 5,008,356; 5,087,677; 5,371 ,158; and 5,324,801.
• the first and second cycloolefin copolymers be derived from cycloolefin starting materials that are substantially the same chemically.
• first cycloolefin copolymer is derived from ethylene and norbomene
• second cycloolefin copolymer also be derived from ethylene and norbomene. It is furthermore advantageous for miscibility that the production of each cyclic olefin results in similar distribution of polyethylene and polynorbomene blocks, achieved typically through the use of same or similar catalysts.
• the second cycloolefin copolymer is present in the compositions of this invention in an amount up to about 10% by weight, based on the total weight of of the composition.
• compositions that contain the second cycloolefin copolymer in amounts of from about 0.5 to about 5 percent by weight, more particularly from about 2 to about 5 weight percent, based on the total weight of the composition are of particular interest.
• the fatty acid esters suitable for use in the practice of this invention are fatty acid esters of aliphatic polyhydric alcohols.
• Such fatty acid esters are preferably those which are obtained by reaction between a saturated natural or synthetic fatty acid and a polyhydric alcohol having at least three hydroxyl groups, such as to partially or completely esterify the hydroxyl groups of the polyhydric alcohol.
• Exemplary of such fatty acids are C ⁇ 2 to C 5 o fatty acids such as, for example, lauric acid, myristic acid palmitic acid, stearic acid, arachidic acid, behenic acid, oleic acid and the like, with C ⁇ 2 to C 22 fatty acids being of particular interest.
• the subject fatty acids may be derived from the reaction of mixtures of such fatty acids and aliphatic polyhydric alcohols.
• suitable polyhydric alcohols are glycerol, diglycerol, pentaerythritol, sorbitol, and the like, and mixtures thereof.
• suitable fatty acid esters are, for example, glycerol monolaurate, glycerol monostearate, glycerol distearate, pentaerythritol distearate, pentaerythritol tetra stearate, sorbitol monolaurate, sorbitol monostearate, and the like, and mixtures thereof.
• Preferred fatty acid esters are fatty acid esters of pentaerythritol, more particularly pentaerythritol tetrastearate and pentaerythritol distearate.
• Fatty acid esters are commercially available from numerous suppliers and include, for example, products available from Lonaz Inc. under the tradenames Glycolube® P and Glycolube® 155.
• the fatty acid esters are generally present in the subject compositions in amounts of from about 0.01 to about 3 percent by weight, preferably from about 0.05 to about 1.5 percent by weight, and most preferably from about 0.1 to about 0.5 percent by weight, based on the total weight of the composition.
• compositions having a Hunter b color value of less than 1.0, preferably less than 0.8 it has now been found possible to provide compositions having an essentially colorless or "water white” appearance when fabricated into molded parts.
• the subject compositions may contain one or more additional optional additives such as, for example, antioxidants, stabilizers, and the like, provided that such additives do not undesirably affect the optical properties of the composition.
• Antioxidants suitable for use in the subject compositions include but are not limited to phenolic, phosphite, phosphonite and lactone antioxidantants and combinations thereof. The following, are examples of some of the antioxidants suitable for use in this
• the total amount of such additional optional additives typically does not exceed about 1 % by weight of the total weight of the composition. More typically, when present, the total amount of such additional optional additives is from about 0.1 to about 0.5 % by weight, based on the total weight of the composition.
• compositions may be prepared by conventional melt blending techniques wherein the cycloolefin copolymers, stabilizer and, when present, additional additives are combined under conditions of elevated temperature and shear.
• the order in which the various composition components are combined is not critical; if desired, the components can be combined in a single or multiple steps.
• the compositions are prepared by extrusion compounding of the components at melt temperatures of from about 240°C to about 270°C, depending upon the particular components utilized and their relative amounts.
• compositions of this invention are useful in the production of molded precision optical articles including, for example, information storage media such as CD, DVD, CD-R, DVD-R, DVD-RW, DVD-R+W, DVD-RAM, lenses, optical display base boards, light enhancing plates, LEDs, mirrors, prisms, and light guides.
• information storage media such as CD, DVD, CD-R, DVD-R, DVD-RW, DVD-R+W, DVD-RAM, lenses, optical display base boards, light enhancing plates, LEDs, mirrors, prisms, and light guides.
• this invention relates to a cycloolefin resin having a Hunter b color value of less than 0.8, which resin consists essentially of: (a) a first cycloolefin copolymer having a glass transition temperature of from about 120°C to about 160°C and an intrinsic viscosity of from about 5 to about 1000ml/g as measured in decalin at 135°C,
• Resins were prepared by extrusion compounding the components listed in Table 1 , in the amounts therein described, in a Werner and Pfleiderer twin screw co-rotating extruder, having a screw diameter of 30mm. Melt temperature was maintained at approximately 260°C. Nitrogen was used over the feed section to minimize oxidative degradation. The resins were extruded, collected and pelletized. Abbreviations used in Table 1 are as follows:
• COC 1 Topas® cycloolefin copolymer grade 5013 (Tg 145°C) available from Ticona, the engineering resins business of Celanese AG.
• the resins were molded into test specimens (2.5" (6.35 cm) diameter discs, 1/8" (0.32 cm) in thickness, molded using a full thickness edge gate; and/or 4" (10.16 cm) diameter discs, 1/8" (0.32 cm) in thickness, also molded using a full thickness edge gate).
• the 4" (10.16 cm) diameter discs were molded on a Demag NCIII injection molding machine having a capacity of 94 cubic centimeters and equipped with a general purpose screw having a screw diameter of 32mm and a mold finished to SPE #1 quality. Molding conditions were as follows: melt temperature: 240°C mold temperature: 120°C screw speed: 125 rpm cycle time: 40 seconds injection speed: 25 mm/sec
• Rounder 220-110 injection molding machine having a capacity of 63 cubic centimeters and equipped with a general purpose screw having a screw diameter of 25mm and a mold finished to SPE #1 quality. Molding conditions were as follows: melt temperature: 240°C mold temperature: 120°C screw speed: 150rpm cycle time: 30 seconds injection speed. 25 mm/sec
• Haze was measured on the same instrument by inserting the specimen in a container filled with the index matching fluid benzyl alcohol, such that the face of the specimen is completely wetted with the fluid.
• the reported haze values represent the subtraction of the value measured on the fluid filled sample holder, without the sample, from the same arrangement measured with the sample inserted.
• Hunter a, b and L values, as well as Yl and haze data, of the molded specimens is reported in Table 2.

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