Coated polyester film and polyester/polyolefin laminates...

Details Coated polyester film and polyester/polyolefin laminates... Coated polyester film and polyester/polyolefin laminates...

B - Operations, Transporting

32

B

154/140, 117/192

B32B 25/08 (2006.01) B32B 27/36 (2006.01)

Patent

CA 1192104

ABSTRACT OF THE DISCLOSURE A coated polyester film suitable for producing polyester/polyolefin laminates consists of biaxially oriented poly(ethylene terephthalate) film coated with a cross-linked styrene copolymer by deposition from an aqueous coating composition which comprises (A) a copolymer containing 50-75 mole % of styrene units and 25-50 mole % of comonomer units providing carboxylic groups (10-50 mole %) and alkyl carboxylate groups (20-50 mole %) and (B) a melamineJformaldehyde cross-linking agent. The styrene copolymer (A) is preferably a water-soluble copolymer of styrene and maleic anhydride partially converted into butyl ester and partially neutralized with ammonia, and the cross- linking agent (B) is conveniently hexamethoxymethylmelamine. The polyolefin layer in the laminates produced may in particular be of low-density polyethylene.

409634

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