Impact modified polymer composition
US4181644A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1978 |
| Grant date | Jan 1, 1980 |
| Priority date | — |
| Expiry date | Mar 23, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L27/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.