Process for producing crosslinked, melt-shaped articles
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsMohamed Esseghir, Jeffrey M. Cogen, Saurav S. Sengupta
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Abstract
Crosslinked, melt-shaped articles are manufactured by a process that does not require the use of post-shaping external heat or moisture, the process comprising the steps of: A. Forming a crosslinkable mixture of a 1. Organopolysiloxane containing one or more functional end groups; and 2. Silane-grafted or silane-copolymerized polyolefin; and B. Melt-shaping and partially crosslinking the mixture; and C. Cooling and continuing crosslinking the melt-shaped article. Crosslinking is promoted by the addition of a catalyst to the mixture before or during melt-shaping or to the melt-shaped article.
Claims8
A process for the manufacture of crosslinked, melt-shaped articles, the process comprising the steps of:
- A. Forming a crosslinkable mixture comprising:
- 1. at most 10 wt %, based on the total weight of the crosslinkable mixture, of an organopolysiloxane containing two functional end groups which are hydroxyl groups, wherein the organopolysiloxane is a polydimethylsiloxane of the formula
- wherein Me is methyl and n is from 10 to 400;
- and
- 2. Silane-grafted polyethylene;
- B. Melt-shaping and partially crosslinking the mixture into an article;
- and
- C. Cooling the melt-shaped article;
- and
- D. Storing the melt-shaped article and continuing crosslinking without external moisture diffusion,
- wherein a crosslinking catalyst is added to the mixture before or during melt-shaping or to the melt-shaped article,
- wherein the melt-shaped article has a thickness of greater than 0.2 mm, and
- wherein the crosslinked, melt-shaped article passes the hot creep test (100% elongation) measured at 200° C., 0.2 MPa load held for 15 minutes in accordance with IEC 60811-2-1.
Dependencies are inferred from the claim text.