US 5,393,592 AGranted

Heat-sealable plastic film

AssigneeBASF SE

InventorHelmut Jenne

Life of this patent

Estimating the term…

Abstract

A heat-sealable plastic film produced by coextrusion or lamination, comprising 2 layers A and C and, if desired, a layer B and, if desired, a layer of an adhesion promoter for bonding each two of the layers A, B (if present) and C (the sum of the thicknesses or of the weights of A, B (if present) and C in each case being 100) comprises from 1 to 50 % of a layer of a heat-sealable, impact resistant polystyrene A, up to 95% of a base layer B and from 1 to 99% by weight of a high-melting plastic layer C.

Claims3

Dependent claims

A heat-sealable plastic film produced by extrusion or lamination, comprising:

a layer A of a heat-sealable mixture of three components A.sub.1, A.sub.2 and A.sub.3, wherein
component A.sub.1 is an impact resistant polystyrene consisting of a styrene polymer resin matrix and a phase which is a graft copolymer of styrene and a rubber selected from the group consisting of polybutadiene;
an elastomeric linear styrene-butadiene two-block copolymer and mixtures thereof,
component A.sub.2 is a styrene-butadiene or styrene-isoprene block copolymer, and
component A.sub.3 is a lubricant;
a layer B of an impact resistant polystyrene resin consisting of from 60 to 95% by weight of a polymer selected from the group consisting of polystyrene, homopolymer of substituted styrene, copolymer of styrene and maleic anhydride, and copolymer of styrene and methylmethacrylate and from 5 to 40% by weight of an elastomeric particulate phase of polybutadiene, styrene grafted onto polybutadiene, styrene-butadiene two-block copolymer or styrene grafted onto linear styrene-butadiene two-block copolymer;
and
a layer C of a high-melting plastic film selected from the group consisting of polycaprolactam, polyhexamethylene adipamide, copolyamide of caprolactam, hexamethylenediamine and terephthalic acid and polybutylene terephthalate.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/003,939Filed 19 Jan 1993 · continuation
Priority: DE 39216771 Jul 1989
Granted: 28 Feb 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B32B 37/153
With at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and…: at…
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/302
Comprising vinyl polymers; comprising acrylic polymers: comprising aromatic vinyl polymers, e.g. styrenic polymers

Family

Serial537,697Parent of this continuation · filed 14 Jun 1990
US 5,393,592 AThis patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

patentgrep

Loading patent…

Abstract

Facts

Application

08/003,939Filed 19 Jan 1993 · continuation

Priority

DE 39216771 Jul 1989

Granted

28 Feb 1995

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

B32B 37/153
With at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and…: at…
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/302
Comprising vinyl polymers; comprising acrylic polymers: comprising aromatic vinyl polymers, e.g. styrenic polymers