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Polymer composition having terminal alkene and terminal carboxyl groups
| Details |
Inventors: Tsao, Jung-Hsien; Hein, Paul R.;
Assignee: W. R. Grace & Co. (Cambridge, MA)
Primary Examiner: Kittle; John E.
Assistant Examiner: Hamilton; Cynthia
Attorney, Agent or Firm: Barrett; Carole F., Baker; William L., McGreal; Michael J.
A polymer composition comprising a urethane having terminal unsaturation and a terminal carboxyl group and which is capable of further free radical polymerization has been synthesized. This polymer can be a liquid or a solid depending on the molecular weight and backbone of the polymer. This polymer as a liquid has been found to be very useful in producing printed circuit boards by photo resist processes. |
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DETAILED DESCRIPTION We claim: 1.
A method for producing a photo resist comprising: (a) (1) providing a composition containing a polymer wherein the polymer consists essentially of a polymer having the formula: ##STR6## wherein R.
sub.
1 is hydrogen, methyl or ethyl, R.
sub.
2 is alkyl of from 1 to 6 carbon atoms, R.
sub.
3 is alkyl, aryl or alkylaryl, (PE) is selected from the group consisting of polyethers, polyesters and mixtures thereof, x is an integer of from 2 to 50 and R.
sub.
4 is alkyl, alkene, aryl or alkyl or alicyclic.
(2) a photo initiator; (b) coating said composition onto at least a portion of a printed circuit board blank; and (c) contacting at least parts of said coated printed circuit board blank with actinic light radiation.
2.
A method for producing a photo resist as in claim 1 wherein said composition contains an additive having the formula: ##STR7## wherein R.
sub.
4 is hydrogen, methyl or ethyl, R.
sub.
5 is alkyl of from 1 to 6 carbon atoms and R.
sub.
6 is alkyl, alkene, aryl or alkyl or alicyclic.
3.
A method for producing a photo resist as in claim 1 wherein said photoinitiator is selected from the group consisting of benzophenone, acetophenone, acenaphthenequinone, O-methoxybenzophenone, dibenzosuberone, anthraquinone, hexanophenone and 2,2-dimethoxy 2-phenyl acetophenone.
4.
A method for producing a photo resist as in claim 2 wherein said composition contains a multifunctional acrylate.
5.
A method for producing a photo resist as in claim 4 wherein said composition additionally contains a multifunctional thiol.
6.
A method for producing a hot melt photo resist comprising: (a) (1) providing a composition containing a polymer having the formula: ##STR8## wherein R.
sub.
1 is hydrogen, methyl or ethyl, R.
sub.
2 is alkyl of from 1 to 6 carbon atoms, --PE-- is selected from the group consisting of polyethers, polyesters and mixtures thereof, x is an integer of from 2 to 50 and R.
sub.
4 is alkyl, alkene, aryl or alicyclic, and (2) a photo initiator; (b) heating said composition to more than 50
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