Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-09-18
1999-10-26
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 86, 525 87, 524186, 524188, 524232, 524261, 524442, 524445, 524447, 524451, C08L 2310, C08L 5106, C08L 5300, C08K 1302
Patent
active
059730706
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE DISCLOSURE
The present invention relates to a polyolefin alloy with improved surface hardness and scratch resistance, and processes for producing same. More specifically, the invention relates to a polyolefin alloy on the basis of a polypropylene material, a functionalized polypropylene material, a mineral, an amorphous silica gel and optionally an ethylene/propylene/polyene terpolymer (EPDM), as well as processes for producing said polyolefin alloy.
Various techniques for increasing the scratch resistance of polyolefin materials are previously known, i.a. addition of silica materials. Thus, JP 1318051 (Toray Silicone KK) discloses polyolefins which for this purpose have been modified with a filler on silica basis. Said filler may have been surface treated with silane type compounds. However, the disclosed polyolefins are not alloys and no fatty acid amide-treated silica gel is used in the material. JP 1104637 (Showa Denko KK) discloses materials on a polypropylene basis to which silica/alumina spheroids and a polypropylene material functionalized with carboxylic acid or carboxylic anhydride have been added. These materials also contains no fatty acid amide-treated silica gel.
It has now been found that when a functionalized polypropylene material and an amorphous, fatty acid amide-modified silica gel are incorporated into certain polyolefin materials having a mineral content, the scratch resistance of the material is substantially improved, with retention of the impact strength and the thermal shape stability (HDTA) of the material.
Thus, the invention provides a new polyolefin alloy having improved surface hardness and scratch resistance, and having a melt index MI in the range of 0.1-50 g/10 min at 230.degree. C./2.16 kg, particularly in the range of 3 to 40 g/10 min at 230.degree. C./2.16 kg. The polyolefin alloy is characterized in that it is constituted by a blend of: polypropylene homopolymer or a copolymer of propylene with ethylene and/or butadiene, which polypropylene material may have a content of polymerized ethylene and/or butadiene units of 5 to 35 mole % and has a molecular weight Mw of 100,000 to 300,000 and a melt index MI of 0.1 to 20 g/10 min at 230.degree. C./2.16 kg, consisting of a grafted polypropylene homopolymer or copolymer of propylene with ethylene and/or butadiene, having a degree of grafting of 0.2 to 10% by weight, 2.5 .mu.m and a maximum particle size of about 20 .mu.m, and being surface-treated with 0.2 to 5% by weight of aminosilane, comprising 25 to 75% by weight of silica and 75 to 25% by weight of fatty acid amide, having a melt index MI in the range of 1 to 10 g/10 min at 230.degree. C./2.16 kg and a Shore D hardness of 30 to 70.
EP-A-0 567 058 (Hirano et al.) discloses compositions having improved elasticity, peeling strength and recoating properties, comprising a polypropylene, an ethylene/.alpha.-olefin copolymer elastomer, and a modified polyolefin having a functional group in either or both ends thereof, as well as certain substituted amines/amides. In addition thereto, the compositions can also contain various additives, among which talc is mentioned. Said compositions of EP-A-0 567 058 do not, however, contain the combination of a functionalized polypropylene material of the same kind as component (B) of the polyolefin alloy of the present invention, with a mineral having been surface-treated with an aminosilane, and a fatty acid-treated silica gel, and they do not suggest any improvement of the scratch resistance.
U.S. Pat No. 4,675,122 (Luers et al.) teaches a combined antiblocking agent and lubricant concentrate based on polyolefin, which contains diatomaceous earth, precipitated silica and/or silica gel as the antiblocking agent, and one more more amides of unsaturated C.sub.18 -C.sub.22 fatty acids. No mention is made of any improvement of the scratch-resistance. Also, it could not be considered to be near at hand to combine the teaching of U.S. Pat No. 4,675,122 with the teaching of the above-discussed EP-A-0 567 058, which also does not
REFERENCES:
patent: 4433073 (1984-02-01), Sano et al.
patent: 4675122 (1987-06-01), Luers et al.
patent: 4751262 (1988-06-01), McKinney et al.
patent: 4808484 (1989-02-01), Yamada et al.
patent: 5286791 (1994-02-01), DeNicola, Jr. et al.
patent: 5486561 (1996-01-01), Hirano et al.
Derwent English-language abstract of Japanese Patent publication 1,318,051 "Plastics Additives Handbook", 3rd Edition, pp. 542-545 (1991).
Borealis A/S
Nutter Nathan M.
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