EP0214790A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coated biaxially oriented film and method of preparing same
Assignee: Mobil Oil AS
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Filing: 1986-08-20
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Granted: —
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Expires: 2006-08-20
Abstract
Abstract A biaxially oriented surface coated polypropylene film and improved method for the continuous production thereof which includes the steps of stretching a continuous essentially polypropylene web in the longitudinal direction, applying a liquid surface coating composition to one or both sides of the continuous web, preheating the coated film to a temperature sufficient to effect orientation, and orienting the resulting preheated coated film in the transverse direction without after-treatment steps such as corona discharge or flame treatment.
Inventors
- 👤 Hee Chung Park
- 👤 Eldridge Milford Mount, Iii
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 05:14
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/02; B05D7/04; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B29C55/026; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J7/048; C08J7/052; B29K; B29K2023/00; B29K2023/10; B29K2023/12; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
A process for the continuous production of polypropylene film useful for packaging which has improved surface properties comprising: stretching in the longitudinal direction a continuous web containing polypropylene as a primary component; applying a coating composition to one or both surfaces of the continuous web; preheating the coated web to a temperature sufficient to effect orientation; and orienting the resulting preheated coated web in the transverse direction in the absence of any required after treatment.
Claim 2
Dependent Claim
75 words
A process for the continuous production of polypropylene film useful for packaging which has improved surface properties comprising: stretching in the longitudinal direction a continuous web containing polypropylene as a primary component; applying a coating composition to one or both surfaces of the continuous web; preheating the coated web to a temperature sufficient to effect orientation; and orienting the resulting preheated coated web in the transverse direction in the absence of any required after treatment.
Claim 3
Dependent Claim
17 words
The process of Claim 1 wherein the web contains from at least 35% polypropylene to 90% polypropylene.
Claim 4
Dependent Claim
15 words
The process of Claim 1 or 2 wherein the continuous web is a multilayer web.
Claim 5
Dependent Claim
22 words
The process of any of the preceding claims wherein the coating composition is in the form of a solution or an emulsion.
Claim 6
Dependent Claim
35 words
The process of any of the preceding claims wherein the coating composition comprises a component selected from acrylic polymers and copolymers, polyvinylidene chloride, polyethylene imine, polyamides, silicones, epoxy resins, styrene based polymers, and emulsifiable polyester.
Claim 7
Dependent Claim
23 words
The process of any of the preceding claims wherein the coating composition includes between 1% and 50% coating material based on solids content.
Claim 8
Dependent Claim
33 words
The process of any of the preceding claims wherein the coating composition comprises a material selected from a release agent, a slip agent, a heat sealing agent, a receptor-enhancer, and a barrier enhancer.
Claim 9
Dependent Claim
47 words
The process of any of the preceding claims wherein the coating material is selected from a release and a slip coating having from 1% to 8% coating material based on solids content and a heat sealing composition having from 15 to 50% material based on solids content.
Claim 10
Dependent Claim
32 words
The process of Claim 8 wherein the film has a seal strength from 118 to 197 gm/cm (300 to 500 gm/in.) at a temperature range from 116° to 149°C (240° to 300°F).
Claim 11
Dependent Claim
26 words
The process of Claim 7 wherein the slip properties of the film is from 0.17 to 0.19 in accordance with tests set forth in ASTM D1894.
Claim 12
Dependent Claim
41 words
The process of any of the preceding claims wherein the film is drawn in the longitudinal direction in a stretch ratio of from 3:1 to 7:1, and oriented in a transverse direction in a stretch ratio of from 6:1 to 10:1.
Claim 13
Dependent Claim
41 words
The process of any of the preceding claims wherein an additive which adds chemical functionality to the base web is added up to 5% by weight of the web, the additive being selected from maleic anhydride, polyacrylic acid polymers and copolymers.
Claim 14
Dependent Claim
37 words
The process of any of the preceding claims wherein the preheating temperature is from 138° to 204°C (280° to 400°F) when the film includes 80% polypropylene and from 79° to 121°C when the web contains 40% polypropylene.
Claim 15
Dependent Claim
31 words
The process of any of the preceding claims wherein the film is passed through a reservoir containing the liquid composition and the transverse direction orientation is effected by a tenter frame.
Claim 16
Dependent Claim
45 words
A polypropylene film with improved surface properties comprising: a biaxially oriented polypropylene web having a solution-applied surface coating on one or both surfaces, the surface coating being applied between sequential machine direction and transverse direction orientation steps in the absence of required after treatment steps.
Claim 17
Dependent Claim
45 words
A polypropylene film with improved surface properties comprising: a biaxially oriented polypropylene web having a solution-applied surface coating on one or both surfaces, the surface coating being applied between sequential machine direction and transverse direction orientation steps in the absence of required after treatment steps.
References Cited (Backward Citations)
No citation records indexed.
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