Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-03-05
1997-03-25
Zemel, Irina
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525194, 525240, 525242, C08L 2316, C08L 6500, C08J 322, C08J 320
Patent
active
056145926
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the making of a peroxide masterbatch in blends of EP(D)M and polyoctenamer rubber and to masterbatches which can be made by such process.
From the Huls Publikationen entitled, "VESTENAMER.RTM. ein ungewohnlicher Kautschuk mit vielfaltigen Moglichkeiten", Research Disclosure 335011 from March 1992, and Kautsch. Gummi, Kunst. st. 42, pp. 1130-1140 (1989) it is known that Vestenamer.RTM., a trans-polyoctenamer rubber, can be used to make masterbatches of rubber additives, including peroxides, and that Vestenamer.RTM. has a low viscosity in comparison to other rubbers. Further, the compatibility of Vestenamer.RTM. with EP(D)M is also mentioned in the Huls publications.
In addition, masterbatches of peroxides in EP(D)M, including significant amounts of filler material, have been sold by Akzo and thus are known in the art.
European Patent application 227 048 discloses the use of blends of two polymers having different melt temperatures as the carrier for peroxide compounds such as dicumyl peroxide. This disclosure does not mention the present blends but suggests that polymer blends having certain properties make useful peroxide carriers. In particular, polymer blends having a melt index of 250-2500 grams/10 minutes, an average softening point of 50.degree.-115.degree. C. and having two distinct melting temperatures, are preferred.
Further, U.S. Pat. No. 4,737,547 discloses polyolefin mixtures which comprise reactive components in low concentrations. The carrier materials are homo- and copolymers of 2-10 carbon atom .alpha.-olefins. U.S. Pat. Nos. 4,397,992; 4,342,844 and 4,808,442 also disclose examples of peroxide masterbatches in polymers.
Finally, trans-polyoctenamer rubbers are known, in general from the publications, Kautschuk+Gummi Kunststoffe 34, Nr. 3/1981, pp. 185-190 and Kautschuk+Gummi Kunststoffe 42, Nr. 10/1989, pp. 868-874. The original nomenclature can be found in IUPAC-Information Bulletin Nr. 29 (1972).
A problem encountered with peroxide masterbatches is that large amounts of fillers are often required in order to make such masterbatches in rubbers due to the high viscosity of rubber compositions. However, users of the masterbatches often do not need fillers in their rubber products and thus would prefer masterbatches without fillers. Further, even if fillers are desired in the rubber, the users of peroxide masterbatches prefer not to be limited in their choice of filler by the presence of filler in the masterbatches. If the masterbatches do not contain filler, then the user of the masterbatch can freely choose which filler(s) he will employ.
Accordingly, the present invention is directed to a process and a masterbatch which overcomes the need for the use of fillers in the production of peroxide masterbatches. These and other objects of the present invention will be apparent from the summary and detailed description which follow.
SUMMARY OF THE INVENTION
The present invention relates, in a first aspect, to a process for the production of a peroxide masterbatch composition comprising the steps of: by weight, based on the weight of the ethylene-propylene copolymer of a polyoctenamer rubber to a mixing device, 2.degree. C. below the melting point of the lowest melting peroxide to be included in the masterbatch composition, peroxide initiator to the mixture, with mixing, while maintaining the temperature of the mixture at least 2.degree. C. below the melting point of the lowest melting peroxide in the peroxide initiatior until the peroxide initiator is substantially intimately mixed with the mixture, that the temperature rises sufficiently to melt the peroxide(s) in the mixture to obtain the masterbatch composition, and
In a second aspect, the present invention relates to a masterbatch composition comprising an ethylene-propylene copolymer, 10-150 parts by weight, based on the weight of the ethylene-propylene copolymer of a polyoctenamer rubber, and 20-60 percent by weight of a peroxide initiator, based on the total weight of the ethylene-propylene
REFERENCES:
patent: 4342844 (1982-08-01), Torenbeek et al.
patent: 4397992 (1983-08-01), Johansson et al.
patent: 4737547 (1988-04-01), White
patent: 4808442 (1989-02-01), Johannes et al.
Diederich K.M. Vestenamer--ein ungewohnlicher Kautschuk mit vielfaltigen Moglichkeiten (contains English summary), Kautschuk & Gummi Kunststoffe, Nov. 1989, Sonderdruck 44.07.010.
Kautschuk & Gummi Kunststoffe, 34, Nr 3/1981,pp. 185-90.
Kautschuk & Gummi Kunstsoffe, vol. 42, No. 12, Dec. 1989, pp. 1130-1140, with Technical Brochure in English entitled: Vestenamer--an unusual rubber with versatile possiblities.
Elastomeric Composition, Research Disclosure 33511, Mar. 1992.
International Search Report, date Sep. 2, 1994.
Draxler, Marl A., Kautschuk & Gummi Kunststoffe 42, Nr 10/89, pp. 868-874 contains English summary.
Derwent Abstract No. 88-326882 of JP 63 241 051.
van Drunen Rudolph
van Moorsel Frans J.
Akzo Nobel N.V.
Mancini Ralph J.
Morris Louis A.
Zemel Irina
LandOfFree
Filler-free peroxide masterbatch and process for making it does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Filler-free peroxide masterbatch and process for making it, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filler-free peroxide masterbatch and process for making it will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2204199