Method for producing oxymethylene copolymer
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United States of America Patent
Stats
-
Feb 27, 2018
Issued Date -
N/A
app pub date -
May 10, 2013
filing date -
May 14, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention is directed to a method for producing an oxymethylene copolymer by subjecting trioxane and 1,3-dioxolane to copolymerization using boron trifluoride or a coordination compound thereof as a catalyst, wherein the copolymerization is conducted in the presence of a steric-hindrance phenol in an amount of 0.006 to 2.0% by weight, based on the weight of the trioxane, using 0.01 to 0.07 mmol of boron trifluoride or a coordination compound thereof as a catalyst, relative to 1 mol of the trioxane, and wherein, at a point in time when the polymerization yield becomes 92% or more, the formed oxymethylene copolymer and a polymerization terminator are contacted to terminate the polymerization.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2013 Application Filing Year
- C08G Class
- 2223 Applications Filed
- 2044 Patents Issued To-Date
- 91.95 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- C08G Class
- 39.35 % this patent is cited more than
- 7 Age
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