Claims
- 1. A method of initiating photopolymerization of olefinically unsaturated photopolymerizable monomeric or oligomeric compounds or mixtures thereof comprising using as the initiator a compound of the formula ##STR10## wherein Ar is phenyl or naphthyl,
- R is hydrogen, alkyl with 1-4 carbon atoms, alkoxy with 1-4 carbon atoms, halogen, dialkylamino with 1-4 carbon atoms in each alkyl group, carboxyl, or alkoxycarbonyl with 1-4 carbon atoms in the alkoxy group,
- X is alkylene having 3 to 6 carbon atoms or alkylene having 6 to 72 carbon atoms interrupted by at least one member selected from the group consisting of ##STR11## and the precursor of X being a polyol having 3-6 hydroxyls and having a hydroxyl number from 100 to 1850,
- R.sub.1 is hydrogen or methyl,
- n is a number with a value from about 2 to about 5, and
- n+m is a number with a value from about 3 to about 6.
- 2. A photopolymerizable binder consisting of mixtures of
- (A) 20-95% by weight of at least one photopolymerizable resin containing more than one olefinically unsaturated C--C double bond, selected from the group consisting of epoxy resins polyesters and polyurethanes,
- (B) 0-75% by weight of at least one acrylic or methacrylic acid ester of a mono- to tetrahydric alcohol or styrene or mixtures thereof, and
- (C) 5-80% by weight of at least one photoinitiator which is a compound of the formula ##STR12## wherein Ar is phenyl or naphthyl,
- R is hydrogen, alkyl with 1-4 carbon atoms, alkoxy with 1-4 carbon atoms, halogen, dialkylamino with 1-4 carbon atoms in each alkyl group, carboxyl, or alkoxycarbonyl with 1-4 carbon atoms in the alkoxy group,
- X is alkylene having 3 to 6 carbon atoms or alkylene having 6 to 72 carbon atoms interrupted by at least one member selected from the group consisting of ##STR13## and the precursor of X being a polyol having 3-6 hydroxyls and having a hydroxyl number from 100 to 1850,
- R.sub.1 is hydrogen or methyl,
- n is a number with a value from about 2 to about 5, and
- n+m is a number with a value from about 3 to about 6.
- 3. A photopolymerizable binder according to claim 2, wherein component A is an unsaturated polyester containing mainly --OOC--CH.dbd.CH--COO--groups as photopolymerizable groups, 1,2-polyepoxides in which 1 mol of 1,2-epoxide groups have been reacted with from 0.6 to 1 mol of (meth)acrylic acid, or polyurethanes containing OH groups, in which 1 mol of OH groups have been esterified with from 0.6 to 1 mol of (meth)acrylic acid.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2825955 |
Jun 1978 |
DEX |
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Parent Case Info
This application is a division of application Ser. No. 046,941 filed June 8, 1979.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4148987 |
Winey |
Apr 1979 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
46941 |
Jun 1979 |
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