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 1-6 ), phenoxy, hydrocarbyl (C 1-18 ), halohydrocarbyl (C 1-18 ), m = 0-3; n = 0, 1; R 1 is hydrogen or methyl; and R 2 is hydrocarbyl free from substituents reactive with iosocyanate.
Inventors
👤 Curtis P. Smith
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-09 19:33
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A polymer characterized by the presence therein of a recurring unit having the formula: ##STR10##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 a substituent selected from the class consisting of halogen, alkoxy from 1 to 6 carbon atoms, inclusive, phenoxy, hydrocarbyl from 1 to 18 carbon atoms, inclusive, and halohydrocarbyl from 1 to 18 carbon atoms, inclusive, m is a whole number from 0 to 3, n is 0 or 1 and R 1 is selected from the class consisting of hydrogen and methyl and R 2 represents hydrocarbyl said hydrocarbyl being free of substituents which are reactive with isocyanate.
Claim 2
Dependent Claim
146 words
A polymer characterized by the presence therein of a recurring unit having the formula: ##STR10##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 a substituent selected from the class consisting of halogen, alkoxy from 1 to 6 carbon atoms, inclusive, phenoxy, hydrocarbyl from 1 to 18 carbon atoms, inclusive, and halohydrocarbyl from 1 to 18 carbon atoms, inclusive, m is a whole number from 0 to 3, n is 0 or 1 and R 1 is selected from the class consisting of hydrogen and methyl and R 2 represents hydrocarbyl said hydrocarbyl being free of substituents which are reactive with isocyanate.
Claim 3
Dependent Claim
14 words
A polymer according to claim 1 wherein said recurring unit has the formula: ##STR11##
Claim 4
Dependent Claim
35 words
A polymer according to claim 1 wherein the remainder of the recurring units present in said polymer are those of the formula: ##STR12##wherein R 1 and R 2 have the significance defined in claim 1.