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EP0312414A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fiber reinforced semi-finished products
Assignee: Azdel Inc
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Filing: 1988-09-26
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Granted: —
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Expires: 2008-09-26
Abstract
Abstract A semi-finished product in sheet form comprises a thermoplastic polymer component and a fibrous reinforcing component. The fibers are from 4 to 50 mm long, and from 10 to 100 % wt of the polymer component is in the form of high melt index polymeric particles homogeneously mixed with the remainder of, or constituting, the polymer component The particles are of melt index greater than 20 g/10 min and serve to improve moldability of the product after fusing the polymer.
Inventors
- 👤 Hubert De Rancourt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:24
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L; C08L23/00; C08L23/02; C08L23/10; C08L2203/00; C08L2203/12; C08L2205/00; C08L2205/02; C08L2205/025
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
95 words
A semi-finished product in sheet form and adapted to be heat transformed into a finished product, comprising a thermoplastic polymer component and a homogeneously dispersed fibrous reinforcing component, characterised in that the reinforcing component comprises fibers of length from 4 to 50 mm and in that from 10 to 100 % wt of the polymer component is in the form of high melt index polymer particles homogeneously mixed with the remainder of, or constituting, the polymer component and having a melt index (2.16 jg at 230° C, ASTM D 1238) greater than 20 g/10 min.
Claim 2
Dependent Claim
95 words
A semi-finished product in sheet form and adapted to be heat transformed into a finished product, comprising a thermoplastic polymer component and a homogeneously dispersed fibrous reinforcing component, characterised in that the reinforcing component comprises fibers of length from 4 to 50 mm and in that from 10 to 100 % wt of the polymer component is in the form of high melt index polymer particles homogeneously mixed with the remainder of, or constituting, the polymer component and having a melt index (2.16 jg at 230° C, ASTM D 1238) greater than 20 g/10 min.
Claim 3
Dependent Claim
30 words
A semi-finished product according to claim 1 wherein the melt index is at least 40g/10 min, preferably at least 100 g/10 min and more preferably at least 150 g/10 min.
Claim 4
Dependent Claim
55 words
A semi-finished product according to claims 1 or 2 wherein the high melt index polymer is present in an amount and is of such a melt index that the melt index of the polymer component is greater than 150 g/10 min, preferably greater than 200 g/10 min and more preferably at least 400 g/10 min.
Claim 5
Dependent Claim
18 words
A semi-finished product according to claims 1, 2 or 3 wherein the high melt index polymer comprises homopolypropylene.
Claim 6
Dependent Claim
36 words
A semi-finished product according to claim 4 wherein the polymer component is 100 o/o homopolypropylene or comprises homopropylene of high melt index and another homopolypropylene of high metal index and another homopolypropylene of lower melt index.
Claim 7
Dependent Claim
21 words
A semi-finished product according to anyone of the preceding claims wherein the reinforcing fibers are from 6 to 30 mm long.
Claim 8
Dependent Claim
27 words
A semi-finished product according to anyone of the preceding claims which comprises from 15 to 60 wt %, preferably from 20 to 40 wt % reinforcing fibers.
Claim 9
Dependent Claim
26 words
A semi-finished product according to anyone of the preceding claims wherein the reinforcing fibers have an aspect ratio of at least 300, preferably at least 600.
Claim 10
Dependent Claim
17 words
A semi-finish product according to anyone of the preceding claims wherein the reinforcing fibers are glass fibers.
Claim 11
Dependent Claim
55 words
A semi-finished product according to anyone of the preceding claims when produced by a wet process comprising forming an aqueous slurry of homogeneously dispersed reinforcing fibers and polymer particles and optionally process aids, (laying the slurry in a thin layer on a mesh, draining the layer and drying same to form the derived semi-finished product.
Claim 12
Independent Claim
64 words
A method of forming a molded article which comprises heating a semi finished product according to anyone of the preceding claims, or a laminate of two or more semi-finished products, to a temperature of at least the melting temperature of the polymer component so as to fuse same, and subjecting the hot fluid material to compression molding to produce an article of desired shape.
Claim 13
Dependent Claim
67 words
A blank suitable for compression molding to form a molded article, which blank comprises one or more semi-finished products according to anyone of claims 1 to 10 which have been hot-pressed, individually or as a laminate, between planar plates at a temperature sufficient to fuse the polymer component into a continuous matrix throughout which the reinforcing fibers are dispersed. Claims for the following Contracting States: GR, ES
Claim 14
Dependent Claim
102 words
A process of manufacture of a semi-finished product in sheet form and adapted to be heat transformed into a finished product, comprising a thermoplastic polymer component and a homogeneously dispersed fibrous reinforcing component, characterised in that said process comprises using as the reinforcing component fibers of length from 4 to 50 mm and using from 10 to 100 % wt of the polymer component in the form of high melt index polymer particles homogeneously mixed with the remainder of, or constituting, the polymer component and having a melt index (2.16 jg at 230° C, ASTM D 1238) greater than 20 g/10 min.
Claim 15
Dependent Claim
102 words
A process of manufacture of a semi-finished product in sheet form and adapted to be heat transformed into a finished product, comprising a thermoplastic polymer component and a homogeneously dispersed fibrous reinforcing component, characterised in that said process comprises using as the reinforcing component fibers of length from 4 to 50 mm and using from 10 to 100 % wt of the polymer component in the form of high melt index polymer particles homogeneously mixed with the remainder of, or constituting, the polymer component and having a melt index (2.16 jg at 230° C, ASTM D 1238) greater than 20 g/10 min.
Claim 16
Dependent Claim
29 words
A process according to claim 1 wherein the melt index is at least 40g/10 min, preferably at least 100 g/10 min and more preferably at least 150 g/10 min.
Claim 17
Dependent Claim
54 words
A process according to claims 1 or 2 wherein the high melt index polymer is present in an amount and is of such a melt index that the melt index of the polymer component is greater than 150 g/10 min, preferably greater than 200 g/10 min and more preferably at least 400 g/10 min.
Claim 18
Dependent Claim
17 words
A process according to claims 1, 2 or 3 wherein the high melt index polymer comprises homopolypropylene.
Claim 19
Dependent Claim
35 words
A process according to claim 4 wherein the polymer component is 100 % homopolypropylene or comprises homopropylene of high melt index and another homopolypropylene of high metal index and another homopolypropylene of lower melt index.
Claim 20
Dependent Claim
20 words
A process according to anyone of the preceding claims wherein the reinforcing fibers are from 6 to 30 mm long.
Claim 21
Dependent Claim
25 words
A process according to anyone of the preceding claims which comprises from 15 to 60 wt%, preferably from 20 to 40 wt % reinforcing fibers.
Claim 22
Dependent Claim
25 words
A process according to anyone of the preceding claims wherein the reinforcing fibers have an aspect ratio of at least 300, preferably at least 600.
Claim 23
Dependent Claim
16 words
A process according to anyone of the preceding claims wherein the reinforcing fibers are glass fibers.
Claim 24
Dependent Claim
58 words
A process according to anyone of the preceding claims wherein said semi-finished product is produced by a wet process comprising forming an aqueous slurry of homogeneously dispersed reinforcing fibers and polymer particles and optionally process aids, (laying the slurry in a thin layer on a mesh, draining the layer and drying same to form the derived semi-finished product.
Claim 25
Independent Claim
65 words
A method of forming a molded article which comprises heating a semi finished product according to anyone of the preceding claims, or a laminate of two or more such semi-finished products, to a temperature of at least the melting temperature of the polymer component so as to fuse same, and subjecting the hot fluid material to compression molding to produce an article of desired shape.
Claim 26
Dependent Claim
69 words
A process of manufacture of a blank suitable for compression molding to form a molded article, which blank comprises one or more semi-finished products obtained by the process according to anyone of claims 1 to 10 comprising hot-pressing said semi-finished products individually or as a laminate, between planar plates at a temperature sufficient to fuse the polymer component into a continuous matrix throughout which the reinforcing fibers are dispersed.
References Cited (Backward Citations)
No citation records indexed.
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