Multilayer protective film
AssigneeThe Dow Chemical Company
InventorsThomas G. Schulz, Mark C. Danner, Glenda J. Cahill, Harvey C. Tung
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Abstract
A multilayer protective film useful in insulated wall structures of appliances such as refrigerators, freezers, or boiler units, for example. The multilayer protective film has a substantially polyolefin protective layer. The multilayer protective film also has a substantially polyolefin surface capable of bonding to polyurethane foam without the use of an adhesive. The multilayer protective film bonds to and protects thermoplastic liners from attack by blowing agents used in the production of polyurethane foam. The multilayer protective film is also adaptable to be regrind-compatible into thermoplastic liners made of styrenic polymers.
Claims21
An insulated structure consisting essentially of:
- (a) an outer wall;
- (b) a substantially styrenic polymer layer;
- (c) an adhesive layer adjacent to said substantially styrenic polymer layer;
- (d) a protective layer adjacent to said adhesive layer, said protective layer consisting essentially of polyethylene and up to about 16 weight percent talc based on the weight of said protective layer;
- (e) a compatibilizing layer adjacent to said protective layer, said compatibilizing layer consisting essentially of polyethylene and a compatibilizer capable of compatibilizing blends of polyethylene and styrenic polymers;
- and
- (f) a polyurethane foam disposed between said protective layer and said outer wall, said foam being adjacent to said compatibilizing layer and said outer wall.
A thermoformable liner consisting essentially of:
- (a) a substantially styrenic polymer layer;
- (b) an adhesive layer adjacent to said substantially styrenic polymer layer;
- (c) a compatibilizing layer adjacent to said adhesive layer, said compatibilizing layer consisting essentially of polyethylene and a compatibilizer capable of compatibilizing blends of polyethylene and styrenic polymers;
- and
- (d) a protective layer adjacent to said compatibilizing layer, said protective layer consisting essentially of polyethylene and up to about 16 weight percent talc based on the weight of said protective layer.
A multilayer protective film consisting essentially of:
- (a) a protective layer consisting essentially of polyethylene and up to about 16 weight percent talc based on the weight of the protective layer;
- (b) a compatibilizing layer adjacent to said protective layer, said compatibilizing layer consisting essentially of polyethylene and a compatibilizer capable of compatibilizing blends of polyethylene and styrenic polymers;
- and
- (c) an adhesive layer adjacent to said compatibilizing layer, said adhesive layer comprising an adhesive polymer adapted to bond to styrenic polymer substrates.
Dependencies are inferred from the claim text.