 Water tree resistant insulating composition |
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| Masonry weep hole insert |
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| Pre-expanded particles of polypropylene resin and inmolded foamed article using the same |
| The polypropylene pre-expanded particle of the present invention comprises a fatty acid amide ... |
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| Carboxylated polymer composition |
| What is claimed is: 1. A water soluble carboxyl group-containing polymer composition, comprising 100... |
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| Photoimageable elements |
| OF THE INVENTION The present invention is directed to photoimageable elements that include a ... |
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| Novel methacrylic polymers having condensation-crosslinkable functionality |
| We claim: 1. An anionically-polymerized addition polymer of at least one ester of methacrylic acid, ... |
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| Composition comprising condensation cross-linkable novel methacrylate polymers |
| We claim: 1. A curable composition comprising (A) an anionically-polymerized addition polymer of at ... |
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| Rubber composition |
| OF THE PREFERRED EMBODIMENTS The acrylic elastomer to be used for the rubber composition of the ... |
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Thermoformable, chemical resistant polymer blends
| Details |
Inventors: Bonekamp, Jeffrey E.; Swartzmiller, Steven B.; Donald, Robert J.; Uzee, Andre J.;
Assignee: The Dow Chemical Company (Midland, MI)
Primary Examiner: Clark; W. Robinson H.
Assistant Examiner:
Attorney, Agent or Firm:
The invention is a recycling process for forming a thermoformable polymer blend comprising: A) from 9 to 90 parts by weight of a monovinylidene aromatic polymer or an impact modified monovinylidene aromatic polymer, comprising from 1 to 25 weight percent of a rubber and 75 to 99 weight percent of a monovinylidene aromatic polymer matrix having a weight average molecular weight (M.sub.w) from 50,000 to 400,000, said weight percents being based on the total weight of said impact modified, monovinylidene aromatic polymer; B) from 9 to 90 parts by weight on an olefin polymer, selected from the group consisting of homopolymers of ethylene or propylene and copolymers of ethylene with one or more C.sub.4-8 alpha-olefins; and C) from 1 to 20 parts by weight of a compatibilizing polymer comprising a styrene-isoprene-styrene triblock copolymer having a weight average molecular weight of from about 50,000 to about 110,000 Daltons wherein the styrene contained in the styrene blocks is from about 25 to 50 weight percent of the total polymer and the sum of A), B) and C) is 100 parts. |
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DETAILED DESCRIPTION OF THE INVENTION Suitable monovinylidene aromatic polymers comprise polymers containing monovinylidene aromatic monomers which are processable into thermoformed articles.
Preferable monovinylidene aromatic polymers include homopolymers of C.
sub.
6-20 monovinylidene aromatic monomers, copolymers of two or more such monomers and copolymers of one or more such monomers with up to 25 weight percent of a copolymerizable comonomer other than a monovinylidene aromatic monomer.
Examples of preferable monovinylidene aromatic monomers are styrene, vinyl toluene, Q-methylstyrene, t-butyl styrene, chlorostyrene, etc.
Examples of preferable copolymerizable comonomers other than a monovinylidene aromatic monomer are N-phenyl maleimide, acrylamide, maleic anhydride, acrylic acid, n-butyl acrylate, methyl methacrylate, etc.
In one embodiment, rubbers having T.
sub.
g less than 0.
degree.
C.
, preferably less than -20.
degree.
C.
, are used to modify the impact properties of the foregoing monovinylidene aromatic polymers.
Examples of preferable rubbers are homopolymers of C.
sub.
4-6 conjugated dienes, especially butadiene or isoprene; copolymers of one or more monovinylidene aromatic monomers and one or more C.
sub.
4-6 conjugated dienes, especially butadiene or isoprene; copolymers of ethylene and propylene or ethylene, propylene and a nonconjugated diene, especially 1,6-hexadiene or ethylidene norbornene; homopolymers of C.
sub.
4-6 alkyl acrylates; copolymers of C.
sub.
4-6 alkyl acrylates and a copolymerizable comonomer, especially a monovinylidene aromatic monomer or a C.
sub.
1-4 alkyl methacrylate.
Also included are graft polymers of the foregoing rubbery polymers wherein the graft polymer is a monovinylidene aromatic polymer.
A preferred monovinylidene aromatic monomer for use in all of the foregoing rubbery polymers is styrene.
A most preferred rubbery polymer is polybutadiene or a styrene-butadiene copolymer.
The above rubbers may be prepared by anionic solution polymerization techniques or by free radically initiated solution, mass, emulsion or suspension processes
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Adhesives and Rubbers 
