Patent · US Expired

Multilayered heat-sealable plastic films

US5540989A · kind A · utility

26Cited by

15References

14Claims

0Family size

Assignee

Roehm GmbH Chemische Fabrik · DE

Inventors

Jurgen Maul · Sulzbach-Rosenberg, DE
Werner Siol · Pfungstadt, DE
Ulrich Terbrack · Reinheim, DE

Key dates

Filing date	Feb 14, 1995
Grant date	Jul 30, 1996
Priority date	—
Expiry date	Feb 14, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31935
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The invention relates to a recycable, heat-sealable plastic film for hermetically sealing plastic containers, comprising at least two layers which mutually adhere, (i) a support layer comprised of an impact resistant polystyrene resin and (ii) a sealing layer consisting essentially of: a) 20-100 weight % of a copolymer P consisting essentially of: (p1) 20-90 weight % methyl methacrylate and/or ethyl methacrylate; (p2) 10-80 weight % of at least one monomer of formula I ##STR1## where R.sub.1 represents an C.sub.3-24 alkyl group; and (p3) 0-10 weight %, preferably 1-8 weight %, of a monomer which is copolymerizable with and different from the monomers (p1) and (p2); and PA2 (b) 0-80 weight % of a block copolymer containing styrene blocks.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.