Polythioether polyurethanes and their preparation

Details Polythioether polyurethanes and their preparation Polythioether polyurethanes and their preparation

1976-05-04

1977-11-22

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

20415922, 260 285R, 260 318Z, 260 37R, 260 79, 260 795R, 260 795C, 260 797, 260609R, 260609B, C08G 1806

Patent

active

040595706

ABSTRACT:
Novel polythioether polyurethanes of superior thermal and oxidative aging stability are prepared from polythioether dithiols derived from addition of dithiols to acetylenes under free radical conditions. These polythioether dithiols having alkyl branching contain the divalent alkylene groups derived from their dithiol and acetylene monomer components in a regularly alternating manner. This dithiol is reacted with an epoxide with an amine catalyst to form a polythioether diol of the formula ##STR1## wherein R is a C.sub.1 -C.sub.30 divalent organic radical, R' is selected from the group consisting of H, C.sub.1 -C.sub.30 alkyl, C.sub.2 -C.sub.30 alkenyl, C.sub.2 -C.sub.30 alkynyl, C.sub.7 -C.sub.20 aralkyl and mixtures thereof, provided that either R has a branched structure or R' is alkyl, R" is H or methyl and n is 2 to 1000. These polythioether diols are chain extended and crosslinked via reactions with organic diisocyanates of the formula R'" (NCO).sub.2 to yield polythioether polyurethanes of the repeating structure: ##STR2## wherein R, R', R" and n are as defined above and R"' is phenylene, tolylene, xylylene, diphenylmethane, chlorophenylene and C.sub.2 to C.sub.12 polymethylene. These polythioether polyurethanes possess superior thermal and oxidative aging stability.

REFERENCES:
patent: 3386963 (1968-06-01), Santaniello
patent: 3647766 (1972-03-01), Bertozzi

Affiliated with

Also associated with

Rating

Polythioether polyurethanes and their preparation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polythioether polyurethanes and their preparation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polythioether polyurethanes and their preparation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2257879