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Unsaturated poly-(carbonate-urethanes) and their applications to photocrosslinking
| Details |
Inventors: Coqueugniot, Annick G.; Bruggeman, Robert J.; Piteau, Marc D.;
Assignee: Societe Nationale des Poudres et Explosifs (Paris, FR)
Primary Examiner: Lieberman; Paul
Assistant Examiner:
Attorney, Agent or Firm: Bucknam and Archer
The invention relates, by way of new products, to poly-(carbonate-urethanes) with acrylic or methacrylic acid terminal groups, of the formula ##STR1## in which X represents either hydrogen or the methyl group, R represents a substituted or unsubstituted alkylene, cycloalkylene or arylene radical, R' represents a lower alkylene radical, Z represents a polycarbonate chain and C, H, N and O respectively represent carbon, hydrogen, nitrogen and oxygen. The unsaturated poly-(carbonate-urethanes) according to the invention are obtained by condensing a diisocyanate with a polycarbonate-diol and a lower hydroxyalkyl acrylate or methacrylate. They constitute a base for photocrosslinkable compositions which resist hydrolysis and possess a good adhesion. |
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DETAILED DESCRIPTION We claim: 1.
The compounds poly-(carbonate-urethanes) with acrylic unsaturations, of the formula ##STR6## in which: X is hydrogen or methyl, R is a substituted or unsubstituted alkylene, cycloalkylene or arylene radical, R' is a lower alkylene radical, Z is a polycarbonate chain originating from a hydroxytelechelating, aliphatic or cycloaliphatic, linear polycarbonate having a molecular weight of between 500 and 3,000 and C,H,N and O respectively are carbon hydrogen, nitrogen and oxygen.
2.
The compound poly-(carbonate-urethanes) with acrylic unsaturations, according to claim 1, which has the formula ##STR7## in which: X is hydrogen or methyl, R is a substituted or unsubstituted alkylene, cycloalkylene or arylene radical, Z is a polycarbonate chain originating from a hydroxytelechelating, aliphatic or cycloaliphatic, linear polycarbonate having a molecular weight of between 500 and 3,000 and C,H,N and O respectively are carbon, hydrogen, nitrogen and oxygen.
3.
Photocrosslinkable compositions comprising an unsaturated polymer, an unsaturated monomer and a photoinitiator, wherein the said unsaturated polymer is a poly-(carbonate-urethane) with acrylic unsaturations, according to claim 1.
4.
Photocrosslinkable compositions according to claim 2, wherein the said unsaturated monomer is a polyfunctional acrylate of low molecular weight.
5.
Photocrosslinkable compositions according to claim 3, wherein the unsaturated monomer is a member selected from the group consisting of pentaerythritol triacrylate, trimethylolpropane triacrylate and hexane-1,6-diol diacrylate.
6.
Photocrosslinkable compositions according to any one of claims 2 to 4, wherein the photoinitiator is chosen from the group comprising benzoin ethers, acetophenone derivatives, and benzophenone in a mixture with an amine.
7.
Films obtained by the photocrosslinking of a composition according to any one of claims 3 to 6.
Description:
The present invention relates to photocrosslinkable compositions which can, for example, be used as a base for varnishes, paints and inks
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