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US 2003/0191241 A1Published application
Block copolymer compositions
AssigneeJapan Elastomer Co., Ltd.
InventorsMasahiro Fujiwara, Yukinori Nakamichi
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AssigneeJapan Elastomer Co., Ltd.
InventorsMasahiro Fujiwara, Yukinori Nakamichi
Estimating the term…
A subject for the invention is to provide an asphalt composition excellent in high-temperature storage stability and low-temperature characteristics and having an excellent balance among properties. Another subject is to provide a resin composition which has a reduced gel content, satisfactory appearance, and excellent balance among properties including impact resistance and is especially suitable for use as thin films such as food wrap films, films for laminating, and heat-shrinkable films or transparent sheet moldings such as trays for foods or for parts of light electrical appliances, etc., blister cases, or the like. The invention provides (1) a composition comprising: (A) from 2 to 40 parts by weight of a block copolymer which is a block copolymer having at least two polymer blocks mainly comprising a vinylaromatic hydrocarbon and further having at least one copolymer block comprising isoprene and 1,3-butadiene and/or at least one copolymer block comprising isoprene, 1,3-butadiene and a vinylaromatic hydrocarbon, the block copolymer having a vinylaromatic hydrocarbon content of from 5% by weight to less than 60% by weight and a total content of isoprene and 1,3-butadiene of from more than 40% by weight to 95% by weight, and the block copolymer having an isoprene/1,3-butadiene weight ratio in the range of from 95/5 to 5/95, a vinyl bond amount less than 40% by weight, and a number-average molecular weight in the range of from 30,000 to 500,000; and (B) from 98 to 60 parts by weight of either at least one thermoplastic resin selected from styrene resins, polyolefin resins, and poly(phenylene ether) resins or an asphalt.
A composition comprising:
A resin composition comprising:
A resin composition obtained by compounding 100 parts by weight of a resin composition comprising:
A resin composition obtained by compounding 100 parts by weight of a resin composition comprising:
A composition comprising:
Dependencies are inferred from the claim text.
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Polyphenylene oxides: not modified by chemical after-treatment
Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one
Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of…:…
Homopolymers or copolymers of hydrocarbons: homopolymers or copolymers of styrene
Term end not estimated
The present invention relates to thermoplastic resin compositions which are reduced in the formation of a gel (crosslinked polymer) due to a block copolymer crosslinking reaction during molding, are reduced in melt viscosity change due to crosslinking and cleavage of block copolymer chains, and are excellent in suitability for film or sheet forming and suitability for injection molding, and to an asphalt composition which is excellent in high-temperature storage stability (unsusceptibility to phase separation) and low-temperature characteristics and has an excellent balance among properties. More particularly, the invention relates to resin compositions comprising a specific block copolymer comprising a vinylaromatic hydrocarbon, isoprene and 1,3-butadiene, and at least one thermoplastic resin selected from styrene resins, polyolefin resins and poly(phenylene ether) resins, and to an asphalt composition comprising a block copolymer of a specific structure comprising a vinylaromatic hydrocarbon, isoprene and 1,3-butadiene, and an asphalt.
Block copolymers comprising a conjugated diene and a vinylaromatic hydrocarbon have satisfactory compatibility with resins such as polystyrene and are advantageously used for improving the impact resistance of these resins.
For example, JP-B-45-19388 and JP-B-47-43618 describe the use of a linear block copolymer or a branched block copolymer as an impact modifier for polystyrene.
Examples of the invention will be described below, but these should not be construed as limiting the scope of the invention.
In Table 1 are shown the block copolymers used in the Examples and Comparative Examples. The block copolymers were produced by adding monomers in the orders and amounts shown in the column Polymer Structure in Table 1 and polymerizing these in cyclohexane solvent using n-butyllithium as an initiator. The vinyl bond amount was regulated by changing the amount of tetramethylethylenediamine to be used. After completion of the polymerization, methanol was added to terminate the polymerization reaction. Thereafter, the stabilizers shown in the note section of Table 1 were added in the amounts shown therein, and the solvent was distilled off to recover the block copolymers.
Properties of the block copolymers were determined in the following manners.