Green strength promoters for epdm/epm compositions

Details Green strength promoters for epdm/epm compositions Green strength promoters for epdm/epm compositions

C - Chemistry, Metallurgy

08

L

C08L 23/16 (2006.01) C08K 3/22 (2006.01) C08K 3/38 (2006.01) C08K 13/02 (2006.01)

Patent

CA 2144224

EPM and/or EPDM compositions exhibiting superior green strength as compared to conventional EPM/EPDM compositions are attained by adding, along with the rubber curing agents and various conventional additives as desired, colemanite and/or alumina trihydrate. Colemanite, alumina trihydrate or a mixture of the two have unexpectedly been found to enhance the green strength of EPM/EPDM compositions prior to vulca- nization. The green strength promoters of this inven- tion utilized in EPM/EPDM rubber compositions allows for faster mixing (shorter mixing cycles) and improved processing rates, such as faster calender throughput rates, to be achieved. The green strength promoters can be utilized in generally any type of EPM and/or EPDM rubber formulation to improve the green strength thereof without adversely effecting the other desired physical properties. These green strength promoters are particu- larly useful in increasing the green strength of amor- phous (non-crystalline) EPM/EPDM compositions.

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