Polyphotoinitiators
First Claim
1. A polyphotoinitiator comprising the hydrosilation reaction product of a host polymer having olefinic or acetylenic unsaturation with at least one grafting agent represented by the formula
wherein (hv) is a photoinitiating aromatic-aliphatic ketone group, R5 is selected from ##STR16## R6 are the same or different organo or halo groups;
n is an integer; and
R8 is selected from alkylene, alkenylene, alkyleneoxy and oxy groups.
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Accused Products
Abstract
Novel polymeric photocleavable photoinitiators are prepared by the hydrosilation reaction of an organosilicon hydride grafting agent which has a photoinitiating aromatic-aliphatic ketone derivative of at least one organo group, with a polymer having a plurality of unsaturated olefinic or acetylenic sites in the presence of a hydrosilation catalyst. Preferred polymers are butadiene or alkyl substituted butadiene polymers and copolymers and vinyl functional polyorganosiloxanes. The grafting agents have the formula (hv)--R8 --R5 --H wherein (hv) is a photoinitiating aromatic-aliphatic ketone group, R8 is selected from alkylene, alkenylene, alkylenoxy and oxy groups, and R5 is selected from ##STR1## the R6 groups are the same or different organo or halo groups and n is an integer.
36 Citations
29 Claims
- 1. A polyphotoinitiator comprising the hydrosilation reaction product of a host polymer having olefinic or acetylenic unsaturation with at least one grafting agent represented by the formula
- space="preserve" listing-type="equation">(hv)--R.sup.8 --R.sup.5 --H
wherein (hv) is a photoinitiating aromatic-aliphatic ketone group, R5 is selected from ##STR16## R6 are the same or different organo or halo groups;
n is an integer; and
R8 is selected from alkylene, alkenylene, alkyleneoxy and oxy groups.- View Dependent Claims (2, 3, 9, 10, 11, 22, 23, 24, 25, 27)
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4. A polyphotoinitiator comprising a polymeric backbone with a plurality of photoinitiating groups pendently attached thereto through intermediate alkylene or alkenylene groups, the photoinitiating groups having the structure;
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space="preserve" listing-type="equation">(hv)--R.sup.8 --R.sup.5 --wherein (hv) is a photoinitiating aromatic-aliphatic ketone group, R5 is selected from ##STR17## R6 are the same or different organo of halo groups;
n is an integer; and
R8 is selected from alkylene, alkenylene, alkyleneoxy and oxy groups. - View Dependent Claims (5, 6, 7, 8, 26)
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12. A method of preparing a polyphotoinitiator comprising the reacting of a host polymer having olefinic or acetylenic unsaturation with at least one grafting agent represented by the formula H--R5 --R8 --(hv), wherein (hv) is a photoinitiating aromatic-aliphatic ketone group;
- R5 is a group selected from ##STR19## R6 are the same of different organo or halogroups;
n is an integer; and
R8 is selected from alkylene, alkenylene, alkyleneoxy and oxy groups, said reaction conducted in the presence of a hydrosilation catalyst. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 21, 28)
- R5 is a group selected from ##STR19## R6 are the same of different organo or halogroups;
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20. A method of preparing a graft copolymer comprising irradiating a polyphotoinitiator composition with UV light, the polyphotoinitiator composition comprising a mixture of an ethylenically unsaturated monomer and a polyphotoinitiator, the polyphotoinitiator comprising a polymeric backbone with a plurality of photoinitiating groups pendently attached thereto, the photoinitiating group having the structure:
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space="preserve" listing-type="equation">(hv)--R.sup.8 --R.sup.5 --wherein (hv) is a photoinitiating aromatic-aliphatic ketone group;
R5 is selected from ##STR22## n is an integer;
R6 are the same or different organo or halo groups; and
R8 is alkylene, alkenylene, alkyleneoxy or oxy. - View Dependent Claims (29)
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Specification