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Transparent impact polymers
| Details |
Inventors: Biletch, Harry A.; Di Manno, Richard A.; Gorka, Robert J.;
Assignee: Polysar Financial Services S.A. (Fribourg, CH)
Primary Examiner: Briggs, Sr.; Wilbert J.
Assistant Examiner:
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher
A thermoplastic polymer comprising a styrenic monomer, an acrylate, a methacrylate and a block copolymer is provided which possesses an unexpected excellent balance of properties including good physical properties, good elongation and a high degree of transparency. Also provided are processes for the preparation of the thermoplastic polymer. |
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DETAILED DESCRIPTION OF THE INVENTION The monomers of the feed mixture of this invention are selected from three specific types and may include a fourth type.
Monomer (a) is a styrenic monomer selected from the group consisting of styrene, p-methyl styrene, tertiary butyl styrene, dimethyl styrene, and the nuclear brominated or chlorinated derivatives thereof, and is preferably styrene, the amount of which is, based on 100 parts by weight of the feed mixture, from about 25 to about 75, preferably from about 35 to about 65 and most preferably from about 40 to about 60, parts by weight.
Monomer (b) is butyl acrylate in an amount of, based on 100 parts by weight of the feed mixture, from about 7 to about 30, preferably from about 8 to about 20 and most preferably from about 8 to about 15, parts by weight.
Monomer (c) is methyl methacrylate in an amount of, based on 100 parts by weight of the feed mixture, from about 10 to about 50, preferably from about 15 to about 40 and most preferably from about 20 to about 40, parts by weight.
Small amounts of a fourth monomer, to act as a branching agent, such as polyethylene glycol dimethacrylate may be present in amounts from 0 up to about 0.
075 parts by weight per 100 parts by weight of the feed mixture.
The other component of the feed mixture is a block copolymer.
The block copolymer is selected from the group consisting of diblock and triblock copolymers of styrene-butadiene, styrene-butadiene-styrene, styrene-isoprene, styrene-isoprene-styrene, partially hydrogenated styrene-butadiene-styrene and partially hydrogenated styrene-isoprene-styrene linear or radial block copolymers having a molecular weight of not less than about 75,000.
By partially hydrogenated block copolymers is meant block copolymers in which the butadiene or isoprene portion has been hydrogenated such that from about 5, preferably from about 30, weight percent to about 90, preferably to about 70, weight percent of the butadiene or isoprene portion has been hydrogenated.
Preferred among the block copolymers are the triblock styrene-butadiene-styrene and styrene-isoprene-styrene block copolymers with the styrene-butadiene-styrene block copolymers being most preferred
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Molecular Biology 
