EP0071349A2
Expired / Lapsed
EP
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Process for producing an extruded and stretched tubular material and stretched tubular material
Assignee: WR Grace and Co Conn
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Filing: 1982-07-02
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Granted: —
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Expires: 2002-07-02
Abstract
Abstract Extruded and stretched tubular material may be produced by an improvement on the blown bubble process for forming thin heat sealable films. In this improvement a spray nozzle, internal to the extruded tubular structure, is used to provide a thin inner coating of a liquid polyorganosiloxane which greatly reduces the internal film welding of extruded tubular polyolefin materials which internally weld at their processing temperature. Additionally, reduction of the internal welding allows films of reduced thickness to be manufactured.
Inventors
- 👤 Walter Berndt Mueller
- 👤 Julian Harry Schoenberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 00:46
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/28; B05; B05D; B05D7/00; B05D7/02; B05D7/04; B05D7/22; B05D7/222; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; B29C37/00; B29C37/0067; B05D5/00; B05D5/08; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/09; B29C48/10; B29K; B29K2023/00; B29K2023/04; B29K2023/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
35 words
Process for producing an extruded and stretched tubular material which comprises coating the interior surface of an extruded tubular material with a polyorganosiloxane and stretching the said tubular material by maintaining a blown bubble therein.
Claim 2
Dependent Claim
35 words
Process for producing an extruded and stretched tubular material which comprises coating the interior surface of an extruded tubular material with a polyorganosiloxane and stretching the said tubular material by maintaining a blown bubble therein.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the said extruded tubular material is a polyolefin or blend of polyolefins.
Claim 4
Dependent Claim
19 words
A process according to claim 1 or 2, wherein the said extruded tubular material is a multi-layer extruded material.
Claim 5
Dependent Claim
24 words
A process according to claim 2 or 3, wherein the said polyolefin or an innermost layer of the said multi-layer coextruded material is polyethylene.
Claim 6
Dependent Claim
16 words
A process according to any of claims 1 to 4, wherein the said polyorganosiloxane is polydimethylsiloxane.
Claim 7
Dependent Claim
27 words
A process according to claim 5, wherein from 1-20 milligrams of polydimethylsiloxane are applied per square foot (10 to 215 mg/m 2 ) of said interior surface.
Claim 8
Dependent Claim
27 words
A process according to claim 6, wherein from 2-16 milligrams of polydimethylsiloxane are applied per square foot (21 to 172 mg/m 2 ) of said interior surface.
Claim 9
Dependent Claim
10 words
An extruded material having an outer layer of a polyorganosiloxane.
Claim 10
Dependent Claim
10 words
An extruded material having an outer layer of a polyorganosiloxane.
Claim 11
Dependent Claim
16 words
An extruded material according to claim 8 having a thickness less than 0.50 mils (0.013 mm.).
Claim 12
Dependent Claim
18 words
An extruded material according to claim 8 or 9 made of a polyolefin or a blend of polyolefins.
Claim 13
Dependent Claim
17 words
An extruded material according to any of claims 8 to 10 which is a multi-layer extruded material.
Claim 14
Dependent Claim
23 words
An extruded material according to claim 10 or 11,wherein the said polyolefin or an innermost layer of said multi-layer coextruded material is polyethylene.
Claim 15
Dependent Claim
16 words
An extruded material according to any of claims 8 to 12, wherein said polyorganosiloxane is polydimethylsiloxane.
Claim 16
Dependent Claim
33 words
An extruded material according to claim 13, wherein the said outer coating comprises from 0.036 mg. to 0.741 mg. of polydimethylsiloxane per square foot (0.38 to 8 mg/m 2 ) of outer coating.
Claim 17
Dependent Claim
32 words
An extruded material according to claim 14, wherein said outer coating comprises from 0.074 mg. to 0.593 mg. of polydimethylsiloxane per square foot (0.8 to 6.4 mg/m 2 ) of outer coating.
References Cited (Backward Citations)
No citation records indexed.
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