C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3056
C08L 27/24 (2006.01)
Patent
CA 1111177
ABSTRACT OF THE DISCLOSURE Chlorinated polyvinyl chloride resin (CPCV) is blended with a block copolymer of styrene and a diene (SD) or of styrene-diene-styrene (SDS), which block copolymer is referred to as a "pro-modifier" because, by itself, it performs a dual function of processing aid and impact modi- fier in CPVC. For tailoring specific desirable impact properties and physical characteristics into a CPVC resin composition, it may be desirable to use a conventional impact modifier in combination with the block copolymer. When the block copolymer is used, such use being referred to as that of a "co-modifier", the block copolymer and con- ventional impact modifier provide a CPVC composition with unexpectedly enhanced impact strength. The block copolymer consists essentially of a vinyl aromatic compound and a conjugated diene such as styrene-diene (SD) diblock co- polymer, or a styrene-diene-styrene (SDS) polyblock copolymer having a linear or radial block structure or mixtures of linear and radial block copolymers. When a conventional impact modifier is used, it may be any elasto- mer additive, preferably a nucleated rubbery graft copoly- mer, but a minor quantity by weight of a synthetic resinous interpolymer which contains no rubber polymer, may also be used.
321405
Goodrich (b.,f.) Company (the)
Sherman
LandOfFree
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