Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-10-04
1989-10-10
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525192, 525193, 525195, 525196, 525197, 525198, 525232, 525237, 524525, C08L 2326, C08L 1502, C08L 2310
Patent
active
048732885
ABSTRACT:
A two-step process for production of thermoplastic elastomer, which comprises dynamically vulcanizing polypropylene and olefinic rubber in the presence of peroxide (1st step), and dynamically vulcanizing the vulcanized mixture, polypropylene and halogenated butyl rubber in the presence of zinc oxide (2nd step). In another method (a) polyolefin and olefin rubber are dynamically cross-linked in the presence of an organic peroxide and (b) in a separate second operation a dynamically vulcanized blend comprising polyolefin and halogenated butyl rubber is prepared and mixed with (a) to disperse (a) and (b) in one another. The thermoplastic elastomer composition is useful in materials for parts of automobiles.
In an example, pp 9 wt. % parts, EPDM 21 wt. % parts, peroxide 0.3 wt. % part and divinylbenzene 0.5 wt. % part were blended and supplied to the first hopper (1) of biaxial extruder as shown in a figure. In the first blending zone (2), temperature and residence time are 200.degree. C. and 60 seconds respectively. And then, to the second hopper (3) of the extruder, pp 50 parts and the vulcanized product (EPDM+chlorinated butyl rubber) 20 parts were supplied and extruded in the heat blending zone (4) above mentioned mixture for 30 seconds of residence time. The physical properties of the composition are MFR: 18, Flex. Mod.: 3,300 (23.degree. C.) and 1,150 (80.degree. C.), Tens. at break: 105, Elong.: 420%, Izod.: No break (room temperature) and 25 (-40.degree. C.) Shore-D: 58, Flow marks: good and paintability: 100/100.
REFERENCES:
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Copy of Abstract from Japanese Patent Publication JP-A-6250354, Exxon Kagaku K.K., Tonen Sekiyu Kagaku K.K.
PCT/US87/00446, Method of Manufacture of Thermoplastic Elastomer Compositions, M. Komatsu et al., International Filing Date Mar. 3, 1987, International Publication Number WO87/05308 and Supplement.
Baba Isao
Kanai Tsuyoshi
Komatsu Masato
Mikami Takashi
Narukawa Kiyotada
Cohen H. L.
Seccuro Carman J.
TOA Nenryo Kogyo K.K.
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