Thermoformed poly (methyl methacrylate) sheets with protective f

Details Thermoformed poly (methyl methacrylate) sheets with protective f Thermoformed poly (methyl methacrylate) sheets with protective f

1992-09-09

1994-01-18

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Nonplanar uniform thickness material

428215, 428218, 428516, 428519, 428520, 428352, 428 42, B29C 5114, B32B 2730

Patent

active

052798836

ABSTRACT:
A process for thermoforming a sheet of poly(methyl methacrylate) which has a reduced viscosity of at least 1.5, protected on at least one of its faces, by a ethylene polymer film, in intimate contact with it, and which has undergone a corona discharge treatment. The protective film of ethylene polymer has a density not exceeding 0.935 and a melt index lower than 1.0 g/10 min. The ethylene polymer film can be coated with a layer of acrylic adhesive after the ethylene polymer film has undergone the corona treatment.

REFERENCES:
patent: 2648099 (1950-04-01), Dunmire
patent: 4141771 (1979-02-01), Barker et al.
patent: 4220683 (1980-09-01), Barker et al.
patent: 4367312 (1983-01-01), Bontinck et al.
patent: 4499130 (1985-02-01), Questel et al.
patent: 4800115 (1989-01-01), Havens

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