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US 5,180,797 AGranted
Process for converting polyketones to polyesters with organic peroxy acid
AssigneeExxon Chemical Patents Inc.
InventorsRichard G. Austin, Tad L. Patton
Life of this patent
Estimating the term…
Abstract
A polyketone having a molecular weight greater than 1,000 and containing 0.01 to 50 mole percent carbonyl groups is contacted directly with an organic peroxyacid to produce a polyester. The polyketone is in a single homogenous phase during the oxidation process and may be in either solid or liquid form. In a preferred embodiment, a molten polyketone is contacted with an organic peroxyacid in a reactive extrusion process to produce polyester pellets.
Claims12
A process for making a polyester comprising:
- contacting a solid or molten polyketone, having a molecular weight greater than 1,000 and containing 0.01 to 50 mole percent carbonyl groups, said carbonyl groups being present in the polymer chain, with an oxidizing agent comprising an organic peroxyacid at a temperature of about 20.degree. C. to about 110.degree. C. to produce a polyester, said organic peroxyacid having from 2 to 30 carbon atoms, the molar ratio of said oxidizing agent to carbonyl in said polyketone being from about 0.1:1 to 30:1 wherein said polyketone and said oxidizing agent are reacted for about five minutes to about 240 minutes.
A process for making a polyester comprising:
- heating a polyketone to a temperature of about 60.degree. C. to about 110.degree. C. to form a molten polymer, said polyketone having a molecular weight greater than 1,000 and containing 0.01 to 50 mole percent carbonyl groups;
- and
- contacting said molten polymer with an oxidizing agent comprising an organic peroxyacid to produce a molten polyester, said organic peroxyacid having from 2 to 30 carbon atoms, the molar ratio of said oxidizing agent to carbonyl in said polyketone being from about 0.1:1 to 30:1.
Dependencies are inferred from the claim text.