Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-09-03
1994-12-27
Szekely, Peter
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
428391, 523212, 523214, 524494, 524504, C08K 906, C08K 340, C08L 5106, B32B 1704
Patent
active
053767012
DESCRIPTION:
BRIEF SUMMARY
The present invention essentially concerns a composition suitable for the preparation of a mineral fibre reinforced thermoplastic matrix polymer composite material, a composite material and a process for making same.
In the prior art, there is already known a surface treatment of glass fibres to improve adhesion with a polymeric matrix. Examples of this prior art are JP-A-57-038548 and JP-A-60-046951, which latter discloses a surface treatment of glass fibres by dipping them in an ammoniacal solution of a copolymer of maleic anhydride and vinylacetate or an ethylenic hydrocarbon of formula CnH.sub.2n with n being from 2 to 5, and a silane coupling agent to provide silanized glass fibres.
In the prior art, there are also known mineral fibre reinforced polyolefin matrix composite materials, comprising mineral fibres, a polyolefin matrix and process aids. Most of them are prepared by a dry process based on melt extrusion. According to the melt extrusion process, all the components are mixed together and extruded when the polymer component is molten to prepare the composition (see for instance JP-A-60-001236). The compositions are said to have excellent mechanical strength.
In the composition, the mineral fibres used, usually glass fibres, can be surface treated with a silane compound, such as an aminosilane.
Different processes are described in order to improve the adhesion between a polyolefinic matrix and a fibrous reinforcing material. Thus, GB-1,378,873 describes the use of a blend of an aromatic monocarboxylic acid or a carboxylic or polycarboxylic acid and a graft copolymer obtained by grafting an unsaturated dicarboxylic acid onto a propylene in a melt mixing and extrusion process of polypropylene and fiberglass.
U.S. Pat. No. 3,755,245 describes a composite obtained by injection moulding of a mixture of polypropylene, organic peroxide, a high molecular weight halogenated organic compound and aminosilane heated glass fibers.
Different processes are also described to prepare fiber glass with specific coatings intended to have improved adhesion with the polyolefinic matrix.
Thus, GB-A-1,174,943 describes inorganic fiber reinforced propylene polymer molding compositions wherein the fibers are coated with the reaction product of aminosilane with anhydride modified polyolefin.
U.S. Pat. No. 4,426,469 describes a specific coating of fiber glass with a three component coating comprising a polyolefinic film forming agent, a silane and a bis-maleamic acid, and the use of these glass fibers to prepare blends with polyolefinic compounds which are treated by injection molding.
U.S. Pat. No. 3,936,415 describes the preparation of glass fibers coated with a mixture of an organosilane coupling agent, an oxidized polyolefin and a carboxylated high molecular weight elastomer. These fibers are then dried and used for the production of reinforced polyolefinic matrix.
U.S. Pat. No. 3,661,628 describes another type of coated fiber glass and their use after being dried and mixed with olefinic polymers to form articles through molding and extrusion.
Other similar melt extrusion prior art compositions are disclosed in JP-A-53-110645, JP-A-58-145750.
Finally, GB-A-1,262,470 (=FR-1,598,204) discloses a surface treatment of inorganic surfaces to improve adhesion of organic coatings comprising a combination of an organosiloxane and of a copolymer of ethylene containing acid units. The disclosure of this document is very broad and the uses disclosed concern coating of any silicous product, such as glass, in the form of panels, pearls, fibres, and notably to provide safety window glass (see page 4, lines 19 to 29). The siloxane alone or a mixture of the siloxane and the ethylenic copolymer containing carboxylic acid groups are applied as a coating on the surface of the substrate (see page 4, lines 112 to 126). In the example given, the coating binder comprises the ethylenic copolymer containing acid functions dispersed in an aqueous solution, in which has been introduced gamma-aminopropyl-(triethoxy)-silane; and a strand of fibre g
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Chow Wai Y.
Goguelin Michel
Exxon Chemical Patents Inc.
Miller Douglas W.
Miller William G.
Szekely Peter
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