Crotonic acid polymer coated substrates for producing optically

Details Crotonic acid polymer coated substrates for producing optically Crotonic acid polymer coated substrates for producing optically

1997-11-11

1999-07-27

Lusignan, Michael

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Weight per unit area specified

4272935, 4274125, 428483, 428413, B32B 2706, B32B 2736

Patent

active

059287810

ABSTRACT:
A method is provided for forming a dissolvable or strippable polymeric release coating on the surface of flexible web, forming an overcoated metallized or optically variable layer on said release coating, and stripping or dissolving the release coating to release the overcoated layer. The release coating comprises a polymer of crotonic acid which is soluble in a solvent such as acetone. The polymer may be a copolymer of crotonic acid and at least one vinyl ester such as vinyl acetate. The release coating may be formed during an in-line process which begins with drawing the flexible web from a molten polymeric material. The methods are particularly advantageous for forming optically variable flakes and multilayered optically variable devices.

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