Claims
- 1. A condensation copolymer obtained by reacting together at least one glycol of general formula HO -- R.sup.4 -- OH where R.sup.4 is an organic radical selected from the group consisting of aliphatic, alicyclic, aromatic and araliphatic hydrocarbon radicals, or a polyether or polyester glycol or polyol, at least one diisocyanate of general formula OCN -- R.sup.5 -- NCO where R.sup.5 is a divalent hydrocarbon radical selected from the group consisting of aliphatic, alicyclic, aromatic and araliphatic, and a monomer of the formula C: ##STR15## where X is selected from the group consisting of methylene chains having 0-6 carbon atoms, and methylene chains of 2-6 carbon atoms interrupted by ester linkages, Q is selected from the group consisting of methylene chains having 1-6 carbon atoms, and methylene chains of 2-6 carbon atoms interrupted by ester linkages, R.sup.2 is hydrogen or an alkyl group of 1-6 carbon atoms, R.sup.3 is an alkyl, aryl, alkaryl or alkenyl group of from 1-12 carbon atoms, the monomer of formula C providing a unit of structure ##STR16## in the backbone of the copolymer, the number of said units being sufficient to provide from about 0.01 weight % to about 3 weight % of ketone carbonyl based upon the total copolymer.
- 2. A condensation copolymer as claimed in claim 1 wherein R.sup.5 is an aromatic radical.
- 3. A condensation copolymer as claimed in claim 2 wherein the glycol is 1,4-butanediol and the diisocyanate is a mixture of 2,4-tolylenediisocyanate and 2,6-tolylenediisocyanate.
- 4. A condensation copolymer as claimed in claim 2 wherein the monomer of formula C is 2-acetyl-1,4-butanediol.
Priority Claims (2)
Number |
Date |
Country |
Kind |
20102/70 |
Apr 1970 |
GBX |
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34238/70 |
Jul 1970 |
GBX |
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CROSS REFERENCE TO RELATED APPLICATION
This is a division, of application Ser. No. 554,451, filed Mar. 3, 1975, now U.S. Pat. No. 4,042,568, which is a divisional application Ser. No. 245,176, filed Apr. 18, 1972, now U.S. Pat. No. 3,878,169, which was in turn a continuation-in-part of U.S. application Ser. No. 135,426, filed Apr. 18, 1971, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
2279752 |
Jacobson |
Apr 1942 |
|
2769783 |
Hollyday, Jr. |
Nov 1956 |
|
2840608 |
Crawford et al. |
Jun 1958 |
|
3039996 |
Ferstandig et al. |
Jun 1962 |
|
Divisions (2)
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Number |
Date |
Country |
Parent |
554451 |
Mar 1975 |
|
Parent |
245176 |
Apr 1972 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
135426 |
Apr 1971 |
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