C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/18
C08G 77/20 (2006.01) C08G 77/38 (2006.01) C09D 183/06 (2006.01) C09D 183/07 (2006.01)
Patent
CA 1296468
ABSTRACT OF THE DISCLOSURE Polysiloxanes with (meth)acrylate ester groups linked over SiC groups are disclosed which are obtainable by the reaction of epoxy- functional polysiloxanes of the general formula Image in which R1 are the same or different low molecular weight alkyl groups with 1 to 4 carbon atoms or phenyl groups, R2 is the same as R1 or represents the R3 group 70 to 100% of the R3 groups being epoxy functional groups and 30 to 0% being alkyl groups with 2 to 20 carbon atoms or hydrogen, with the proviso that the average molecule contains at least 1.5 epoxy groups, a has a value of 1 to 1,000 and b a value of 0 to 10. with such amounts of an acid mixture, comprising (a) 10 to 90 mole percent of (meth)acrylic anhydride and (b) 90 to 10 mole percent of (meth)acrylic acid, that the sum of (a) and (b) adds up to 100 mole percent, and that there are present 0.8 to 1.9n and preferably 1.1 to 1.9n acid equivalents per n epoxide equivalents. The polysiloxanes are useful as radiation-curable abhesive coating materials for flat backings. The siloxanes adhere well to the backing that is to be coated and cured at a high rate, the coating having a good chemical and physical resistance and a high flexibility The abhesive coating can be matched to the chemical character of the adhesive and adjusted to the desired degree of abhesiveness.
558203
Jachmann Jurgen
Weitemeyer Christian
Wewers Dietmar
Goldschmidt Gmbh
Marks & Clerk
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