Compounds and process

Details Compounds and process Compounds and process

1977-01-31

1978-01-10

Hamrock, William F.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

260 775CR, 526 27, 526 43, 526 46, 526 57, 526275, C08F 1232, C08F 818, C08F 824, C08F 840

Patent

active

040680550

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## WHEREIN THE BROKEN LINES IN THE PHOSPHOLENE NUCLEUS INDICATE A DOUBLE BOND LOCATED BETWEEN THE CARBON ATOM AT POSITION 3 AND ONE OF THE CARBON ATOMS AT POSITIONS 2 AND 4, THE H atom is attached to whichever carbon atom at positions 2 and 4 is not part of said double bond, R is halogen, alkoxy (CH.sub.1-6), phenoxy, hydrocarbyl (C.sub.1-18), halohydrocarbyl (C.sub.1-18), m = 0-3; n = 0, 1; R.sub.1 is hydrogen or methyl; and R.sub.2 is hydrocarbyl free from substituents reactive with iosocyanate.

REFERENCES:
patent: 3855186 (1974-12-01), Moedritzer
patent: 3855352 (1974-12-01), Moedritzer

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