Compounds and process

Details Compounds and process Compounds and process

1977-01-31

1978-07-04

Hamrock, William F.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 43, 526 46, 526240, 526346, 526 44, 526 47, 528552, C08F 822, C08F 824, C08F 842

Patent

active

040989739

ABSTRACT:
Modified polystyrenes are described which are catalysts for the conversion of organic isocyanates to the corresponding carbodiimides. The modified polystyrenes are characterized by the presence of recurring units of the formula: ##STR1## R.sub.1 and R.sub.2 are hydrocarbyl which is free of substituents reactive with isocyanate groups, R.sub.3 is hydrogen, chloro or methyl, R.sub.4 is hydrogen or methyl, and n is 0 or 1.
The use of the above polymers to catalyze the formation of carbodiimides from organic isocyanates is also disclosed.

REFERENCES:
patent: 3970603 (1976-07-01), Gray
patent: 3995094 (1976-11-01), Crosby et al.

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