Polypropylene sheet for press-through packages, production proce

Details Polypropylene sheet for press-through packages, production proce Polypropylene sheet for press-through packages, production proce

1986-08-22

1989-09-26

Buffalow, Edith

Stock material or miscellaneous articles

Hollow or container type article

Paper containing

428516, 525240, 264346, 264348, 206531, 206532, B29D 2200

Patent

active

048699381

ABSTRACT:
Disclosed herein is a polypropylene sheet obtained by forming a resin composition, which contains a polypropylene resin and a hydrogenated petroleum resin in specific amounts, into a sheet at a particular chill-roll temperature and then annealing the sheet at a specific temperature for a specific period of time as well as an improved production process of such a polypropylene sheet. Also disclosed is a polypropylene sheet comprising a sheet obtained from the above resin composition and a polypropylene layer of at least 10 .mu.m thick applied on at least one side of the sheet. A polypropylene resin composition suitable for the production of such polypropylene sheets is also disclosed. The above polypropylene sheets are suitable for use in press-through packages.

REFERENCES:
patent: Re29705 (1978-07-01), Compere
patent: 3386645 (1968-06-01), Powell
patent: 3456038 (1969-07-01), Newman et al.

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