Blend for improving the brittleness and cold flowability of a carbon dioxide-propylene oxide copolymer and method for producing the same
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United States of America Patent
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Issued Date -
May 24, 2007
app pub date -
Oct 31, 2006
filing date -
Nov 21, 2005
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Abandoned
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Abstract
The present invention relates to improvement of the brittleness and cold flowability of a carbon dioxide-propylene oxide copolymer (PPC). The invention provides a blend comprising 50 to 98 parts by weight of a PPC; 2 to 50 parts by weight of a poly(butylenes succinate) (PBS) or poly(butylene succinate/adipate) (PBSA); 1 part by weight of a maleic anhydride, and 0.5 to 3.0 parts by weight of SiO.sub.2 and a method for producing the same. Compared with the pure PPC, the elongation rate at break of the blend of the invention increases by 3 to 15 times while the tensile strength maintains at 30 MPa or more. The blend of the PPC and PBSA can keep its dimension stably at 70.degree. C., while the blend of the PPC and PBSA can keep its dimension stably at 55.degree. C. No viscous flow occurs at these temperatures.
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