Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Reexamination Certificate
2000-11-01
2003-07-08
Nakarani, D. S. (Department: 1773)
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
C049S490100, C277S628000, C277S650000, C428S122000, C428S515000, C428S517000, C428S519000, C428S521000
Reexamination Certificate
active
06589664
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a laminated product comprising a substratum layer of an olefinic thermoplastic elastomer and a surface skin layer, and to a constructional gasket.
A variety of materials have heretofore been employed for parts and portions requiring rubbery elasticity in the field of automobile parts, industrial machinery parts, electric and electronic parts, and constructional materials. For example, for doors, leafs and sashes of buildings there are provided guide members called gasket which facilitate an opening-closing operation for going-in-and-out and for ventilation, and which, moreover, make possible an operation of tightly shutting doors against the portions that come into contact with the doors.
For the gasket to be used for construction, there have heretofore been used mainly soft synthetic resins such as soft poly (vinyl chloride) resin and vulcanized rubbers such as ethylene-propylene-diene copolymer rubber.
Further, for the portions requiring a higher performance of sliding property, special materials have been employed such as foamed silicone rubbers.
The hitherto used gaskets made of soft synthetic resins and made of vulcanized rubber are not particularly superior in sliding property and, hence, their function as gasket tends to be lowered, what with permanent set in fatigue and what with big deformation occurring through a prolonged use. Further, the vulcanized rubber, since being a thermosetting type rubber, cannot be put to recycled use.
Although the above-mentioned problem can be solved by using such a material excellent in sliding property as foamed silicone rubber, the arising problem is that the rubber is expensive compared with generally used soft synthetic resins and vulcanized rubbers.
OBJECTS AND SUMMARY OF THE INVENTION
The first object of the present invention is to provide a constructional gasket excellent in durability, excellent in the property of giving a tight contact upon closing doors or the like and excellent in the property of giving a lilting slide upon opening doors or the like by using an economical and recyclable laminated material.
The second object of the present invention is to provide a constructional gasket superior in durability and in sealing and hermetic property for doors and windows by using an olefinic thermoplastic elastomer composition capable of being reclaimed which can be produced simply without employing a crosslinking agent with a single production process and moreover produced at a low cost.
Namely, the present invention includes the following inventions.
(i) A laminate comprising an olefinic thermoplastic elastomer which comprises:
(a) a substratum layer comprising an olefinic thermoplastic elastomer composition (A) having the following characteristics {circle around (1)} to {circle around (3)}:
{circle around (1)}
9
≦Y
−0.43
X
≦27 (1)
wherein X denotes the JIS A-hardness value (a dimensionless value) of the olefinic thermoplastic elastomer composition determined according to the prescription of JIS K6301 and Y represents the compression set value (expressed by %) of the olefinic thermoplastic elastomer composition determined according to the prescription of JIS K6301 under a condition of 70° C. and 22 hours,
{circle around (2)} a tensile strength value in the range from 5 to 30 MPa determined according to the prescription of JIS K6301 and
{circle around (3)} an elongation set value of 18% or less determined according to the prescription of JIS K6301, and
(b) a surface skin layer comprising an ultra high molecular weight polyolefin composition (B) having an intrinsic viscosity [&eegr;] measured in decalin at 135° C. in the range from 3.5 to 8.3 dl/g.
(ii) A laminate as defined in the above (i), wherein the olefinic thermoplastic elastomer composition (A) is obtainable by dynamically heat treating 5 to 60 parts by weight of a polyethylene resin (a-1) and 40 to 95 parts by weight of an ethylene-&agr;-olefin-based copolymer (a-2) having a Mooney viscosity ML
1+4
(100° C.) of 90 to 250 and an ethylene content of 70 to 95 mole % [the total amount of (a-1) and (a-2) being 100 parts by weight.]
(iii) A laminate as defined in the above (i), wherein the olefinic thermoplastic elastomer composition (A) is obtainable by dynamically heat treating 5 to 60 parts by weight of a polypropylene resin (a-3) and 40 to 95 parts by weight of an &agr;-olefin-based copolymer (a-4) having a Mooney viscosity ML
1+4
(100° C.) of 60 to 250 [the total amount of (a-3) and (a-4) being 100 parts by weight.]
(iv) A laminate as defined in the above (i), wherein the ultra high molecular weight polyolefin composition (B) is an ultra high molecular weight polyolefin composition comprising an ultra high molecular weight polyolefin (b-1) having an intrinsic viscosity [&eegr;] measured in decalin at 135° C. in the range from 10 to 40 dl/g and a polyolefin (b-2) having an intrinsic viscosity [&eegr;] measured in decalin at 135° C. in the range from 0.1 to 5 dl/g, and the ultra high molecular weight polyolefin (b-1) is present in a ratio of 15 to 40% by weight to the total amount of 100% by weight of the ultra high molecular weight polyolefin (b-1) and the polyolefin (b-2).
(v) A laminate as defined in the above (ii), wherein the olefinic thermoplastic elastomer composition (A) contains 30 parts by weight or less of a polypropylene resin (a-5) to the total amount 100 parts by weight of the polyethylene resin (a-1) and the ethylene-&agr;-olefin-based copolymer (a-2).
(vi) A laminate as defined in any one of the above (i) to (v), wherein the surface skin layer comprising the ultra high molecular weight polyolefin composition (B) is composed of 10 to 90 parts by weight of the ultra high molecular weight polyolefin composition (B) and 90 to 10 parts by weight of an olefinic thermoplastic elastomer composition (C) comprising a crystalline polyolefin resin and a rubber [the total amount of (B) and (C) being 100 parts by weight].
(vii) A laminate as defined in any one of the above (i) to (v), wherein the surface skin layer comprising the ultra high molecular weight polyolefin composition (B) is composed of 10 to 90 parts by weight of the ultra high molecular weight polyolefin composition (B), 90 to 10 parts by weight of the olefinic thermoplastic elastomer composition (C) comprising a crystalline polyolefin resin and a rubber [the total amount of (B) and (C) being 100 parts by weight] and 0.1 to 25 parts by weight of an organopolysiloxane (D).
(viii) A glass-run channel for automobile comprising a laminate as defined in any one of the above (i) to (vii).
(ix) A constructional gasket comprising a laminate as defined in any one of the above (i) to (vii).
(x) A constructional gasket comprising an olefinic thermoplastic elastomer composition (A) having the following characteristics {circle around (1)} to {circle around (3)}:
{circle around (1)}
9
≦Y
−0.43
X
<27 (1)
wherein X denotes the JIS A-hardness value (a dimensionless value) of the olefinic thermoplastic elastomer composition determined according to the prescription of JIS K6301 and Y represents the compression set value (expressed by %) of the olefinic thermoplastic elastomer composition determined according to the prescription of JIS K6301 under a condition of 70° C. and 22 hours,
{circle around (2)} a tensile strength value in the range from 5 to 30 MPa determined according to the prescription of JIS K6301 and
{circle around (3)} an elongation set value of 18% or less determined according to the prescription of JIS K6301.
(xi) A constructional gasket as defined in the above (x), wherein the olefinic thermoplastic elastomer composition (A) is obtainable by dynamically heat treating 5 to 60 parts by weight of a polyethylene resin (a-1) and 40 to 95 parts by weight of an ethylene-&agr;-olefin-based copolymer (a-2) having a Mooney viscosity ML
1+4
(100° C.) of 90 to 250 and an ethylene content of 60 to 95 mole % [the tot
Kobayashi Kyoko
Sakamaki Noboru
Uchiyama Akira
Mitsui Chemicals Inc.
Nakarani D. S.
LandOfFree
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