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US4464510A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the preparation of a material of composite structure

Assignee: Muanyagipari Kutato Intezet
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Filing: 1982-08-17
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Granted: 1984-08-07
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Expires: 2002-08-17
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Abstract

Abstract The invention relates to a process for the preparation of a material of composite structure containing a thermoplastic plastic and a fibrous polymer skeleton material, having a high modulus of torsional shear, good shockproofness and being processable by the formation technologies of thermoplastic plastics. According to the invention one proceeds in such a way that the fibrous polymer skeleton material is treated with a resin mixture consisting of an unsaturated polyester resin and a vinyl monomer in an amount of 1-80 percent by weight, related to the skeleton material. The use of the polyester as adhesion-intermediator considerably improves the homogeneity of the material of composite structure, it makes the substance processable without pregranulation on an extruder with a broad slot or a calendrette, and leads to plates the shockproofness of which significantly exceeds that of plates prepared without such intermediator.

Inventors

  • 👤 Tibor J. Czvikovszky
  • 👤 Tamas Pazonyi
  • 👤 Laszlone I. Topolcai
  • 👤 Janos Kleban

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 19:33
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 111 words
A process for the preparation of a thermoplastic material of a composite structure containing 20-98% by weight, preferably 30-80% by weight, of a thermoplastic basic plastic, including polyethylene, polypropylene or polyvinyl chloride, and 2-80% by weight, preferably 20-60% by weight of a fibrous polymer skeleton material of natural origin, the thermoplastic material having a high modulus of torsional shear, good shockproofness and being processable by the formation technologies of thermoplastic plastics, characterized in that the fibrous polymer skeleton material is previously treated with a resin mixture consisting of an unsaturated polyester resin and a vinyl monomer in an amount 1-80% by weight, preferably 2-40% by weight, related to the skeleton material.
Claim 2
Dependent Claim 111 words
A process for the preparation of a thermoplastic material of a composite structure containing 20-98% by weight, preferably 30-80% by weight, of a thermoplastic basic plastic, including polyethylene, polypropylene or polyvinyl chloride, and 2-80% by weight, preferably 20-60% by weight of a fibrous polymer skeleton material of natural origin, the thermoplastic material having a high modulus of torsional shear, good shockproofness and being processable by the formation technologies of thermoplastic plastics, characterized in that the fibrous polymer skeleton material is previously treated with a resin mixture consisting of an unsaturated polyester resin and a vinyl monomer in an amount 1-80% by weight, preferably 2-40% by weight, related to the skeleton material.
Claim 3
Dependent Claim 92 words
A process as claimed in claim 1, in which the system is submitted to a treatment comprising stirring the fibrous skeleton material and the unsaturated polyester resin, allowing the mixture to swell, suctioning off excess resin to be reused, and then admixing the thermoplastic basic polymer, thereby promoting the reaction between the fibrous polymer skeleton material and the matrix comprising the thermoplastic basic plastic and the unsaturated polyester resin, the resulting mixture is then readily processable by the formation technologies of thermoplastic plastics, including injection molding, extrusion, calendering vacuum formation, and die-casting.
Claim 4
Dependent Claim 26 words
A process as claimed in claim 2, characterized in that the treatment is carried out with 0.1-3% by weight of chemical initiator added to the polyester.
Claim 5
Dependent Claim 33 words
A process as claimed in claim 2, characterized in that the natural fibrous polymer is irradiated with ionizing radiation of a dose of 0.1-100 kGy, preferably 0.5-50 kGy, in the presence of air.

References Cited (Backward Citations)

US3485777A Cited
US4026849A Cited
US4374215A Cited
US4359548A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-08-07 1988-02-06 1988-08-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-08-07 1992-02-06 1992-08-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-08-07 1996-02-06 1996-08-07 $7700.00 Window Closed / Lapsed

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