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Thermoplastic elastomeric resin composition and a process for the preparation thereof

a technology of thermoplastic elastomer and resin composition, which is applied in the direction of optics, vehicle components, tyre parts, etc., can solve the problems of unsatisfactory block copolymer composition, compositions that do not meet the requirements of properties, and tensile properties are significantly deteriorated

Inactive Publication Date: 2003-03-27
RIKEN TECHNOS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The present inventors have noticed that an organic peroxide generate radicals, which then effect crosslinking of polyethylene and molecule cutting of polypropylene, particularly effect molecule cutting of polypropylene to deteriorate the physical properties in the elastomer composition obtained. We have now found that when a smallest amount of polypropylene needed for increasing the flowability during melting is added and an amount of polyethylene for obtaining proper dispersion is used, it is possible to enhance the crosslinking of polyethylene and dispersion of rubber component and to prepare the thermoplastic elastomer composition having excellent properties. This finding leads to the present invention.

Problems solved by technology

However, these block copolymer compositions are unsatisfactory in compression set at a high temperature, particularly at 100.degree. C. and, moreover, tensile properties deteriorate considerably at 80.degree. C. or more.
Thus, such compositions do not meet the levels of properties required in the fields of vulcanized rubber.
However, these polyolefin type thermoplastic elastomers are poor in softness and, therefore, exhibit poor sealing property.
However, these polystyrene type thermoplastic elastomer compositions cannot meet the n-heptane extraction test of the tests of Notification No. 20 of the Japanese Welfare Ministry, because softening agents such as paraffinic oil are generally added to these compositions in order to control their hardness.
Accordingly, it is hard to use them as a cap sealing.
Alternatively, if the paraffinic oil is not used, the softness and moldability of them deteriorate.
However, the composition disclosed are poor in heat resistance at 120.degree. C.
However, heat resistance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0092] The present invention is further elucidated with reference to the following Examples and Comparison Examples, which is not intended to limit the invention. The evaluation methods used were as follows:

[0093] 1) Hardness: determined in accordance with the Japanese Industrial Standards (JIS) K 7215. Pressed sheets having a thickness of 6.3 mm were used as test pieces.

[0094] 2) Tensile strength: determined in accordance with JIS K 6301 using a test piece which was obtained by punching out a pressed sheet having a thickness of 1 mm by a No. 3 dumbbell die. The tensile speed was 500 mm / min. In Examples 1 to 5 and Comparison Examples 1 to 10, the test temperature was room temperature (23.degree. C.), 60.degree. C. or 80.degree. C.

[0095] 3) Tensile elongation: determined in accordance with JIS K 6301 using a test piece which was obtained by punching out a pressed sheet having a thickness of 1 mm by a No. 3 dumbbell die. The tensile speed was 500 mm / min.

[0096] 4) Stress at 100% elonga...

examples 6 to 11

[0157] In Examples 6 to 11, components (a), (c) and (d) and optionally (e) were charged all together into a twin-screw kneader, kneaded at a kneading temperature of 180 to 240.degree. C. and a screw rotation speed of 100 rpm and pelletized. The pellets obtained were put in a predetermined mold and pressed in the conditions of 220.degree. C. and 50 kg / cm.sup.2 to prepare sheets for the aforesaid evaluation methods (1) to (6). The results are as shown in Table 5.

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PUM

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Abstract

The invention provides a process for the preparation of a thermoplastic elastomeric resin composition comprising melt kneading (a) 100 parts by weight of a block copolymer consisting of at least two polymeric blocks (A) composed mainly of a vinyl aromatic compound and at least one polymeric block (B) composed mainly of a conjugated diene compound, and / or a hydrogenated block copolymer obtained by hydrogenating said block copolymer, (b) 40 to 240 parts by weight of a non-aromatic softening agent for rubber, (c) 5 to 300 parts by weight of polyethylene or a copolymer composed mainly of ethylene, and (d) 5 to 60 parts by weight of polypropylene or a copolymer composed mainly of propylene, characterized in that the process comprises the following steps: (I) melt kneading the whole amounts of components (a), (b) and (d) and a part of component (c), and, at the same time or subsequently, melt kneading these with (f) an organic peroxide, and (II) melt kneading the product obtained from step (I) with the remaining part of component (c), and component (c) is one which has been prepared using a single site catalyst. The obtained composition is soft and excellent in heat deformation resistance and mechanical strength, moldability and processability. The present invention also provide a thermoplastic elastomeric resin composition comprising the above components (a), (c) and (d) in an amount of 100 parts by weight, 5 to 150 parts by weight and 5 to 80 parts by weight, respectively. The composition is soft and excellent in heat deformation resistance and mechanical strength, moldability and processability and shows good results in the extraction tests.

Description

[0001] The present invention relates to a process for the preparation of a thermoplastic elastomeric resin composition.[0002] The present invention also relates to a thermoplastic elastomeric resin composition.PRIOR ART[0003] Thermoplastic elastomeric resins which are rubber-like materials, do not need a vulcanization process and have thermoplastic resin-like molding processability are attracting attention in the fields of auto parts, parts for electric appliances, electric wire insulation, footwears and general goods, and in the field of cap sealing materials.[0004] Various types of such thermoplastic elastomeric resins have been developed and put on sale, such as polyolefine type, polyurethane type, polyester type, polystyrene type and polyvinyl chloride type.[0005] Among those, polystyrene type thermoplastic elastomeric resins such as styrene-butadiene block copolymers (SBS) and styrene-isoprene block copolymers (SIS) and hydrogenated resins thereof have high softness and good ru...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L23/04C08L23/08C08L23/10C08L53/00C08L53/02C08L91/00C08L91/06C08L91/08
CPCC08L23/04C08L23/0815C08L23/10C08L23/12C08L53/00C08L53/02C08L53/025C08L91/00C08L91/06C08L91/08C08L2205/02C08L2205/03C08L2205/035C08L2312/00C08L2666/24C08L2666/02C08L2666/04
Inventor TASAKA, MICHIHISATAMURA, AKIHIRO
Owner RIKEN TECHNOS CORP
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