Thermoplastic elastomer copolymer films

a technology of thermoplastic elastomer and copolymer, which is applied in the field of thermoplastic elastomer blends, can solve the problems of high cost of raw materials, undesirable excessive blocking, and high cost of copolyesters and/or ethylene vinyl acetate copolymers

Inactive Publication Date: 2004-01-06
EXXON CHEM PAT INC
View PDF11 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

A process for producing the elastomeric film of this invention comprises the steps of (a) providing a thermoplastic elastomeric film blend of (1) a block copolymer elastomer and (2) an LLDPE having a density of from about 0.86 to 0.900 g/cm.sup.3, a MWD in the range of 2 to about 3.5, a melt index of less than 1000 dg/min, and an ethylene ...

Problems solved by technology

For example, elastomeric films containing thermoplastic urethanes, copolyesters and/or ethylene vinyl acetate copolymers are expensive due to the cost of raw materials.
While these films demonstrate suitable properties for most elastomeric film applications, the shortcomings of these films are (1) a significantly reduced elasticity of the patented blend as compared to the elastic property of the pure elastic S-B-S copolymer; (2) difficulty in processing of the blend; and (3) typically excessive blocking of the S-B-S elastomeric copolymer.
These films generally exhibit good strength and elastic ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Thermoplastic elastomer copolymer films

Examples

Experimental program
Comparison scheme
Effect test

example 1

Blend Formulation:

Component Percentage KRATON D2104 63% LD 767.36 27% MBX - 6 10%

The material extruded satisfactorily with good melt strength as indicated by the observed bubble stability. The collapsed film was peeled with no sticking or fusing, thereby qualitatively determining "openability" as good and given an "A" rating (based on an A, B, C, D scale with "A" being good and "D" being poor). The film appearance rating (FAR) was slightly grainy and qualitatively given a "B" rating based a scale which qualifies a totally clear film as an "A" rating while an opaque film would be rendered a "D". This film is the "control" and will be used as the comparison hereinafter.

example 2

Blend Component Percentage KRATON D2104 63% XS 12.04 27% Ethyl Methyl Acrylate ("EMA") MBX - 6 10%

The film produced had a less grainy appearance and rated a FAR of "B". Openability was slightly less than Example 1 and rated a "B" to "C". Elastic recoverability was slightly improved over the control. The MD tensile set was 20% vs 22.6% (13% improvement) while the TD had a 17% improvement (18% vs. 21.2%).

example 3

Component Percentage KRATON D2104 63% TAFMER P0480 27% MBX - 6 10

The material processed well with observed excellent bubble stability and received a FAR rating of "A". The openability was slightly less ("B") than the control but tensile set was substantially improved. The MD set was 14.1% vs. 22.6% (60% improvement) while the TD set displayed a 35% improvement (15.7% vs. 21.2%).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Lengthaaaaaaaaaa
Lengthaaaaaaaaaa
Login to view more

Abstract

Disclosed are (1) a thermoplastic elastomeric film comprised of an elastomeric arene-diene block copolymer and particular ethylene/.beta.-olefin copolymers having low ethylene crystallinity and (2) the process of preparing films thereof. The disclosed films have superior strength and elasticity characteristics which render them particularly useful in apparel and healthcare items such as disposable diapers.

Description

FIELD OF INVENTIONThis invention relates to thermoplastic elastomer blends of elastomeric block copolymers and certain olefin copolymers and, more specifically, to the fabricated films of the blends which exhibit high tensile strength and elasticity.BACKGROUND OF THE INVENTIONThermoplastic elastomers are readily commercially available and are fabricated as elastomeric films in products such as disposable diapers, leggins, waistbands and gloves. Typically, these elastomeric films have been made of elastomeric block copolymers, combinations of elastomeric block copolymers and liquid butadienes, combinations of elastomeric block copolymers and ethylene vinyl acetate copolymers, thermoplastic urethanes, ethylene-propylene rubbers (EP or EPR), including ethylene-propylene diene terpolymers (EPDM), natural rubbers and combinations of polyester copolymers and ethylene-vinyl acetate copolymers. Each of these materials has suitable properties for elastomeric films, such as low tensile set, l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B29D7/00B29D7/01C08L23/00C08J5/18C08L23/08C08L53/02C08L53/00A61L15/24C08F210/16C08L23/06
CPCC08L53/02A61L15/24B29D7/01B29K2009/06B29K2023/0625B29K2023/083B29K2105/0088C08F210/16C08J5/18C08J2323/08C08L23/06C08L23/0815C08L23/0853C08L23/0869C08L2205/03C08L2205/035C08L2310/00
Inventor ERDERLY, THOMAS CRAIGMACKAY, JOHN HUGHNARRAMORE, RUSSELL HARREL
Owner EXXON CHEM PAT INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap