Patent US4632869A successfully refreshed from Google Patents.
US4632869A
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Resin composition, opaque film and method of preparing same
Assignee: Mobil Oil AS
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Filing: 1985-09-03
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Granted: 1986-12-30
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Expires: 2005-09-03
Abstract
Abstract A resin combination comprising a thermoplastic polymer matrix having dispersed therein as distinct phases, a multiplicity of small spherical solid particles of polybutylene terephthalate, the resin combination in opaque biaxially oriented polymeric film form and the same oriented film structure having on at least one surface thereof a void-free thermoplastic skin layer. The process for preparing a biaxially oriented opaque film comprising providing said resin combination, forming an unoriented film of said resin combination and biaxially orienting said film to an extent sufficient to opacify the same. The process also provides for the opaque film having a void-free thermoplastic skin layer on at least one surface thereof.
Inventors
- 👤 Hee C. Park
- 👤 Jeffrey J. O'Brien
- 👤 Christopher R. Fosmire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:54
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/20; B32B27/205; B32B27/06; B32B27/08; B32B27/32; C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L23/00; C08L23/02; C08L23/10; C08L67/00; C08L67/02; B32B38/00; B32B38/0012; B32B2038/0028; B32B2264/00; B32B2264/02; B32B2264/0214; B32B2264/0278; B32B2264/0285; B32B2307/00; B32B2307/40; B32B2307/41; B32B2307/412; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249986; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
24 words
A resin combination comprising a thermoplastic polymer matrix having dispersed therein as distinct phases, a multiplicity of small spherical solid particles of polybutylene terephthalate.
Claim 2
Dependent Claim
24 words
A resin combination comprising a thermoplastic polymer matrix having dispersed therein as distinct phases, a multiplicity of small spherical solid particles of polybutylene terephthalate.
Claim 3
Dependent Claim
19 words
The resin combination of claim 1 wherein said particles are from about 0.1 to about 10 microns in size.
Claim 4
Dependent Claim
12 words
The resin combination of claim 2 wherein said polymer matrix is polypropylene.
Claim 5
Dependent Claim
33 words
The resin combination of claim 3 wherein the dispersed particle population is of such a proportion that on biaxial orientation of a film thereof said film will turn bright whitish opaque in appearance.
Claim 6
Dependent Claim
91 words
An opaque, biaxially oriented polymeric film structure comprising: a thermoplastic polymer matrix material within which is located a strata of voids; and positioned at least substantially within at least a substantial number of each of said voids is at least one spherical void-initiating solid particle of polybutylene terephthalate which is phase distinct and incompatible with said matrix material, the void occupied by said particle being substantially less than the volume of said void, with one generally cross-sectional dimension of said particle at least approximating a corresponding cross-sectional dimension of said void.
Claim 7
Dependent Claim
91 words
An opaque, biaxially oriented polymeric film structure comprising: a thermoplastic polymer matrix material within which is located a strata of voids; and positioned at least substantially within at least a substantial number of each of said voids is at least one spherical void-initiating solid particle of polybutylene terephthalate which is phase distinct and incompatible with said matrix material, the void occupied by said particle being substantially less than the volume of said void, with one generally cross-sectional dimension of said particle at least approximating a corresponding cross-sectional dimension of said void.
Claim 8
Dependent Claim
13 words
The film structure of claim 5 wherein said polymeric matrix material is polypropylene.
Claim 9
Dependent Claim
18 words
The film structure of claim 6 wherein said particle is from 0.1 to about 10 microns in size.
Claim 10
Dependent Claim
18 words
The film structure of claim 5 having on at least one surface thereof a void-free thermoplastic skin layer.
Claim 11
Dependent Claim
11 words
The film of claim 8 wherein said skin layer is transparent.
Claim 12
Dependent Claim
59 words
A process for preparing a biaxially oriented opaque film comprising: (a) providing a resin combination comprising a thermoplastic polymer matrix having dispersed therein as distinct phases, a multiplicity of small spherical solid particles of polybutylene terephthalate; (b) forming an unoriented film of said resin combination; and (c) biaxially orienting said film to an extent sufficient to opacify the same.
Claim 13
Dependent Claim
59 words
A process for preparing a biaxially oriented opaque film comprising: (a) providing a resin combination comprising a thermoplastic polymer matrix having dispersed therein as distinct phases, a multiplicity of small spherical solid particles of polybutylene terephthalate; (b) forming an unoriented film of said resin combination; and (c) biaxially orienting said film to an extent sufficient to opacify the same.
Claim 14
Dependent Claim
27 words
The process of claim 10 wherein a void-free thermoplastic skin layer is formed on at least one surface of said unoriented film which is thereafter biaxially oriented.
Claim 15
Dependent Claim
11 words
The process of claim 11 wherein said skin layer is transparent.
Claim 16
Dependent Claim
11 words
The process of claim 12 wherein said matrix resin is polypropylene.
References Cited (Backward Citations)
US4242398A
Cited
US4377616A
Cited
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |