Title:
METHOD FOR PRODUCING GLASS FIBER-REINFORCED POLYESTER RESIN COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2023/203913
Kind Code:
A1
Abstract:
A method for producing a glass-fiber-reinforced polyester resin composition, the resin composition comprising 10-60 mass% of (A) a polyester resin, 40-70 mass% of (B) glass fibers, and 0-50 mass% of (C) another polymer or additive and being produced using a biaxial extruder, wherein the method is characterized in that: the 265°C, 91/sec shear viscosity of the resin composition is 400-2,000 Pa∙s; the method has a first step for kneading (A) and (C) using a first kneading unit, a second step for adding the (B) glass fibers and kneading using a second kneading unit, a third step for depressurizing a vent, devolatilizing, pressurizing, and then extruding from a die mounted on a die holder, and a fourth step for cooling the strands exiting the die using water and cutting the strands using a pelletizer; and the extrusion is carried out such that the resin pressure within the die in the third step is 2-9 MPa.
Inventors:
TAJIRI TOSHIYUKI (JP)
TAKEHANA MASARU (JP)
TAKEHANA MASARU (JP)
Application Number:
PCT/JP2023/009195
Publication Date:
October 26, 2023
Filing Date:
March 10, 2023
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
International Classes:
B29B9/06; B29B7/48; B29B7/72; B29B9/14; B29C48/285; B29C48/345; B29C48/86; B29C48/92; C08J3/12; C08J3/215; C08K7/14; C08L67/00
Foreign References:
| JPH0631821A | 1994-02-08 | |||
| JPH11245280A | 1999-09-14 |
Attorney, Agent or Firm:
ATAGO IP (JP)
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