EP0124310A2
Expired / Lapsed
EP
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Low coefficient of friction film structure and method of forming the same
Assignee: Mobil Oil AS
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Filing: 1984-04-13
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Granted: —
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Expires: 2004-04-13
Abstract
Abstract The invention relates to a composite oriented structure having at least one thin surface layer containing highly subdivided inorganic material in an antiblock and coefficient of friction reducing proportion, the thin layer being formed simultaneously or sequentially on a comparatively thick base layer and thereafter oriented and the method of preparing the multi- layer structure.
Inventors
- 👤 Lawrence James Gust
- 👤 Eileen Frances O'sullivan
- 👤 Ronald Clark Wood, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 22:40
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/32; B32B27/322; B32B2272/00; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
123 words
A transparent oriented multilayer film structure having a haze percentage of less than about 3 comprising: (a) a comparatively thick base layer of an optically clear thermoplastic resin; (b) a comparatively thin surface layer on at least one surface of layer (a), the surface layer comprising an optically clear thermoplastic resin containing uniformly dispersed therein a finely divided inorganic material in a proportion sufficient to thereby impart antiblock characteristics and decreased film to film coefficient of friction to the resulting layer in oriented form; the structure being biaxially oriented so that the thickness of the surface layer and the proportion of the inorganic material in the surface layer is such that the % haze of the oriented film is about 3 or less.
Claim 2
Dependent Claim
123 words
A transparent oriented multilayer film structure having a haze percentage of less than about 3 comprising: (a) a comparatively thick base layer of an optically clear thermoplastic resin; (b) a comparatively thin surface layer on at least one surface of layer (a), the surface layer comprising an optically clear thermoplastic resin containing uniformly dispersed therein a finely divided inorganic material in a proportion sufficient to thereby impart antiblock characteristics and decreased film to film coefficient of friction to the resulting layer in oriented form; the structure being biaxially oriented so that the thickness of the surface layer and the proportion of the inorganic material in the surface layer is such that the % haze of the oriented film is about 3 or less.
Claim 3
Dependent Claim
20 words
The structure of Claim 1 wherein the inorganic material has a mean particle size of from 0.2 to 5.0 microns.
Claim 4
Dependent Claim
21 words
The structure of Claim 2 wherein the film to film coefficient of friction of layer (b) is about 0.4 or less.
Claim 5
Dependent Claim
17 words
The structure of Claim 2 wherein the thermoplastic resin is the same in layers (a) and (b).
Claim 6
Dependent Claim
16 words
The structure of Claim 2 wherein the thermoplastic resin in layers (a) and (b) are different.
Claim 7
Dependent Claim
10 words
The structure of Claim 4 wherein the resin is polypropylene.
Claim 8
Dependent Claim
31 words
The structure of Claim 6 wherein the inorganic material is a member selected from the group consisting of a silica an aluminum-silicate; a sodium-aluminum silicate; a carbon black and mixtures thereof.
Claim 9
Dependent Claim
22 words
The structure of Claim 7 wherein the thickness of layer (b) is 10% or less of the overall thickness of the structure.
Claim 10
Dependent Claim
19 words
The structure of Claim 7 wherein the inorganic material is a mixture of dehydrated kaolinite and a sodium-aluminum silicate.
Claim 11
Dependent Claim
16 words
The structure of Claim 7 wherein the inorganic material is a silica-alumina ceramic in spherical form.
Claim 12
Independent Claim
167 words
A method of preparing a thermoplastic film structure comprising: (a) preparing a skin resin of a finely divided, uniformly dispersed inorganic material in an optically clear thermoplastic resin, either in one step or by first preparing a concentrate of the inorganic material in the resin and diluting the concentrate with additional thermoplastic resin so that the proportion of inorganic material in the skin resin is sufficient to impart antiblock characteristics and decrease the inherent film to film coefficient of friction of an oriented film of the thermoplastic resin to about 0.4 or less; (b) forming either simultaneously or sequentially a composite of a comparatively thin surface layer of the composition of (a) on at least one surface of a comparatively thick base layer of optically clear thermoplastic layer, and (c) orienting the composite so that the thickness of the surface layer and the proportion of the inorganic material in the surface layer is such that the % haze of the oriented composite is about 3 or less.
Claim 13
Independent Claim
167 words
A method of preparing a thermoplastic film structure comprising: (a) preparing a skin resin of a finely divided, uniformly dispersed inorganic material in an optically clear thermoplastic resin, either in one step or by first preparing a concentrate of the inorganic material in the resin and diluting the concentrate with additional thermoplastic resin so that the proportion of inorganic material in the skin resin is sufficient to impart antiblock characteristics and decrease the inherent film to film coefficient of friction of an oriented film of the thermoplastic resin to about 0.4 or less; (b) forming either simultaneously or sequentially a composite of a comparatively thin surface layer of the composition of (a) on at least one surface of a comparatively thick base layer of optically clear thermoplastic layer, and (c) orienting the composite so that the thickness of the surface layer and the proportion of the inorganic material in the surface layer is such that the % haze of the oriented composite is about 3 or less.
Claim 14
Dependent Claim
20 words
The method of Claim 11 wherein the inorganic material has a mean particle size of from 0.2 to 5.0 microns.
Claim 15
Dependent Claim
19 words
The method of Claim 11 wherein the thermoplastic resin of the base layer and the surface layer are different.
Claim 16
Dependent Claim
20 words
The method of Claim 11 wherein the thermoplastic resin of the base layer and the surface layer are the same.
Claim 17
Dependent Claim
11 words
The method of Claim 14 wherein the thermoplastic resin is polypropylene.
Claim 18
Dependent Claim
26 words
The method of Claim 11 wherein the inorganic material is a member selected from the group consisting of an aluminum silicate; carbon black; and mixtures thereof.
Claim 19
Dependent Claim
27 words
The method of Claim 16 wherein the thickness of the surface layer of the oriented structure is 10% or less of the thickness of the overall structure.
Claim 20
Dependent Claim
19 words
The method of Claim 11 wherein the inorganic material is a mixture of dehydrated kaolinite and a sodium-aluminum silicate.
Claim 21
Dependent Claim
18 words
The method of Claim 11 wherein the inorganic material is a silica-alumina ceramic particulate material in spherical form.
References Cited (Backward Citations)
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