Photopolymerisation process with two exposures of a single layer
US4440850A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1982 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Jul 12, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/027
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A layer of a liquid composition containing a compound (A) having in the same molecule at least one (meth)acryloyl group and at least one bicyclo[2.2.1]hept-2-ene-6-yl unit is exposed to actinic radiation so that the layer solidifies due to photopolymerisation of (A) through the (meth)acryloyl group(s), remaining, however, photocrosslinkable. When desired, the solidified layer is exposed, as through a negative, to a substantially greater amount of actinic radiation, the parts so further exposed becoming more highly photocrosslinked through the bicyclo[2.2.1]hept-2-ene-6-yl unit(s) and hence insoluble. An image is produced which can be developed by means of suitable solvents. Examples of (A) include 3-(methacryloyloxy)-2-hydroxypropyl bicyclo[2.2.1]hept-2-ene-6-carboxylate and 2-(acryloyloxy)ethyl methyl-5-carboxybicyclo[2.2.1]hept-2-ene-6-carboxylate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.