Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-03-23
1980-01-01
Ziegler, J.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
525 80, 525 84, 525 96, C08K 714, C08L 5300
Patent
active
041816447
ABSTRACT:
Chlorinated polyvinyl chloride resin (CPVC) 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 modifier 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 so used, such use being referred to as that of a "co-modifier", the block copolymer and conventional impact modifier provide a CPVC composition with unexpectedly enhanced impact strength. The block copolymer consists essentially of a vinyl aromatic compound and a conjugated idene, such as styrene-diene (SD) diblock copolymer, 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 elastomer additive, preferably a nucleated rubbery graft copolymer, but a minor quantity by weight of a synthetic resinous interpolymer which contains no rubber polymer, may also be used.
REFERENCES:
patent: 3793406 (1974-02-01), Bortnick et al.
patent: 3801529 (1974-04-01), Potter
Penn, PVC Technology (Wiley Interscience, 1972) pp. 161, 372.
Lindsay James R.
The B. F. Goodrich Company
Ziegler J.
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