CA1155577A - Exterior grade polyvinyl chloride film - Google Patents

Abstract

Abstract EXTERIOR GRADE POLYVINYL CHLORIDE FILM

A polyvinyl chloride film capable of withstanding at least 275 and preferably 400 hours in a General Products Ultra-Violet Accelerometer before losing its elongation.

Description

F.XTERT ~ (7RADE PO_YVINYL C7-~LOR.CDE_'ILM

rrechn~cal Field ~his invention relates ko a polyvinyl chloride film that exhibits resistance to ~iscoloration upon exposure ~or 275 and pref'erably for 400 hours in a General Products Ultra-Violet Accelerometer. Alt}lough polyvlnyl chloride film is widely used it is known that polyvinyl chloride does not stand up well upon exposure to sunlight.
Therefore the automobl~e inc~ust,ry uses acrylic films or films o~her than vinyl chloride where clear or non-discoloring laminates are desired.

Disclosure of the Inventiorl We have discovered that polyvinyl chloride can be compounded and a film be produced there~rom that unexpectedly exhibits color stability f'or ~'15 hours and preferably for 400 hours in a General Products IJltra-Violet Accelerometer Model No. NST-A. In some respects the resulting film is equivalent to lO0 percent acryllc film which has been accepted for prolonged sunlight exposure.
We have discovered a polyvinyl chlori.de film exhibiting resistance to discoloration upon exposure for 275 hours in a General Products Ultra-Vlolet Accelerometer, said film being composed of a polyvinyl chloride plasticized with a polymeric polyester adipate with a viscosity o~ 3000 to 7000 centistokes at 25C
and an epoxidized soybean oil and containing stabilizing amounts of tris-nonylphenyl phosphite, Ba-Cd-Zn stabiliæer and 2-(2-hydroxy-5-methylphenyl) benzotriazole.
3 Preferably the film of this invention is plasticized with poly-2-ethylhexyl adipate.

Best Mo _ for Carryin~ Out the Invention The film of this invention can be formed in conven-tional manner from polyvinyl chloride compos:t.tions which have been compounded on a mill according to the resi.pes of Table I before being formed into a film of ~he ~auge 7 ~
la shown. The film o~ Table I ~as ~ormed ~rom a tetrahydro ~uran solution and then dried to remove the solvent.

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~ ile cer-tain represen-ta-tive embodimen-ts and details have been sho~m for the purpose of illustra-ting -the invention it will be app~rent to t'nose skilled in -this art that various changes and modifications may be made -therein without depar-ting from the splrit or scope of the invention.

Claims (2)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A polyvinyl chloride film exhibiting resistance to discoloration upon exposure for 275 hours in a General Products Ultra-Violet Accelerometer, said film being composed of a polyvinyl chloride plasticized with a polymeric polyester adipate with a viscosity of 3000 -to 7000 centistokes at 25° C. and an epoxidized soybean oil and containing stabilizing amounts of -tris-nonylphenyl phosphite, Ba-Cd-Zn stabilizer and 2-(2-hydroxy-5-methyl-phenyl) benzotriazole,

2. The film of Claim 1 wherein the polymeric polyester adipate is poly-2-ethylhexyl adipate.