Diene/acrylate based impact modifier for PVC

Details Diene/acrylate based impact modifier for PVC Diene/acrylate based impact modifier for PVC

1983-07-12

1984-04-17

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 83, 525902, C08F27902

Patent

active

044435851

ABSTRACT:
Impact modifiers having high efficiency at low levels and at low temperatures comprising at least three stages, Stage A being a non-crosslinked polymer of at least 70% butadiene and at least 10% lower alkyl (C.sub.2 -C.sub.8) acrylate, Stage B being a polymer of at least 80% styrene, and Stage C containing at least 50% methyl methacrylate and at least 1% alkyl (C.sub.1 -C.sub.4) acrylate, the ratio of Stages A:B:C, excluding optional additional stages, being about 70-85:10-15:10-20, the ratio of stages C:B being at least 1, and Stage A being non-agglomerated are disclosed. Also disclosed are methods of preparing the impact modifier and thermoplastic polymer compositions containing the impact modifier.

REFERENCES:
patent: 4078018 (1978-03-01), Chauvel

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