Process of drilling organic glasses using a thermoplastic film protecting against cracking and crazing
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United States of America Patent
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Sep 1, 2015
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app pub date -
Jul 30, 2013
filing date -
Feb 10, 2011
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Abstract
The present invention is drawn to a process of drilling organic glasses, comprising the steps of:
- (a) providing a substrate of organic glass, preferably of optical grade,(b) laminating onto at least one surface of said organic glass substrate via an adhesive layer selected from the group consisting of pressure sensitive adhesives and hot melt adhesives, a thermoplastic polymer film having a thickness of at least 40 μm and an elastic modulus of at least 3 GPa, the peel strength of the thermoplastic polymer on the organic glass substrate being higher than 1.3 N/25 mm, preferably of at least 1.5N/25 mm,(c) drilling a hole through the substrate and polymer film by means of a drill, and(d) optionally removing the thermoplastic polymer film and adhesive.
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