US RE37,699 E1 · Film containing alpha-olefin/vinyl aromatic copolymer

Abstract

Film and sheet materials, and articles made therefrom, such as bags, pouches, trays, etc., comprise one or more layers of a thermoplastic, homogeneous alpha-olefin/vinyl aromatic copolymer, preferably an ethylene/styrene copolymer. The alpha-olefin/vinyl aromatic copolymer has properties which can can provide a desired performance characteristics such as impact resistance, printability, RF sealability, free shrink, optics, as well as many others. The homogeneous alpha-olefin-vinyl aromatic copolymer may be present in a mono-layer film, either alone or in a blend, or may be included in one or more layers of a multilayer film. Also included is a multilayer thermoformable article comprising a web having a film of such alpha-olefin/vinyl aromatic copolymers thereto. Finally, also included is an RF-sealable film comprising such copolymers.

Claims73

Dependent claims

A multilayer film, comprising:

(A) a first outer layer comprising a first polypropylene;
(B) an inner layer between the first outer layer and the second outer layer, the inner layer comprising a composition comprising a thermoplastic, homogeneous alpha-olefin/vinyl aromatic copolymer comprising:
(i) recurring units of the formula:
wherein:
x≧y;
R2 is a member selected from the group consisting of hydrogen, C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, or and mixtures thereof:
R2 is a member selected from the group consisting of hydrogen, C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, or and mixtures thereof;
provided that R1 and R2 cannot both be alkyl;
and
R3 is a member selected from the group consisting of hydrogen, aromatic, or and mixtures thereof;
R4 is a member selected from the group consisting of hydrogen, aromatic,or and mixtures thereof;
provided that one, and only one, member selected from the group consisting of R3 and R4, is aromatic;
and
(ii) provided that a copolymer portion between every two adjacent members selected from the group consisting of aromatic CHR3 and aromatic CHR4 comprises at least two —CH2—;
and
(C) A second outer layer comprising a second polypropylene.

13 more elements

A multilayer film, comprising:

(A) a first layer, the first layer being an outer layer, the first layer comprising a composition comprising a first thermoplastic, homogeneous alpha-olefin/vinyl aromatic copolymer, wherein the copolymer comprises:
(i) recurring units of the formula:
wherein:
x≧y;
R1 is a member selected from the group consisting of hydrogen, C1 alkyl, C2alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, or and mixtures thereof;
R2 is a member selected from the group consisting of hydrogen, C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, or and mixtures thereof;
provided that R1 and R2 cannot both be alkyl;
and
R3 is a member selected form the group consisting of hydrogen, aromatic, or and mixtures thereof;
R4 is a member selected from the group consisting of hydrogen, aromatic, or and mixtures thereof;
provided that one, and only one, member selected from the group consisting of R3 and R4, is aromatic;
and
(ii) provided that a second copolymer portion between every two adjacent members selected from the group consisting of aromatic CHR3 and aromatic CHR4 comprises at least two —CH2—:
(B) a second layer, the second layer being an inner layer;
and
(C) a third layer, the third layer being an outer layer, the third layer comprising a second thermoplastic, homogeneous alpha-olefin/vinyl aromatic polymer, wherein the copolymer comprises:
(i) recurring units of the formula:
wherein:
x≧y;
R1 is a member selected from the group consisting of hydrogen, C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl C5 alkyl, C6 alkyl, or and mixtures thereof;
R2 is a member selected from the group consisting of hydrogen, C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, or and mixtures thereof;
provided that R1 and R2 cannot both be alkyl;
and
R3 is a member selected from the group consisting of hydrogen, aromatic, or and mixtures thereof;
R4 is a member selected from the group consisting of hydrogen, aromatic, or and mixtures thereof;
provided that one, and only one, number selected from the group consisting of R3 and R4, is aromatic;
and
(ii) provided that a second copolymer portion between every two adjacent members selected from the group consisting of aromatic CHR3 and aromatic CHR4 comprises at least two —CH2—.

25 more elements

Dependencies are inferred from the claim text.

Film containing alpha-olefin/vinyl aromatic copolymer

Life of this patent

Film containing alpha-olefin/vinyl aromatic copolymer

Life of this patent

Abstract

Claims73