The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11299585 B1

Date of Patent:

Apr. 12, 2022

Filed:

Oct. 15, 2018

Oligocarbonate polyols obtained from dianhydrohexitol dialkylcarbonate or a dimer of dianhydrohexitol carbonate, method for the production thereof and uses thereof

Applicant:

Roquette Freres, Lestrem, FR;

Inventors:

Jean-Marc Corpart, Lambersart, FR;

René Saint-Loup, Lomme, FR;

Assignee:

ROQUETTE FRERES, Lestrem, FR;

Attorney:

Primary Examiner:

Terressa Boykin

Int. Cl.

CPC ...

C08G 18/44 (2006.01); C08G 64/30 (2006.01); C08G 64/02 (2006.01); C08G 64/40 (2006.01);

U.S. Cl.

CPC ...

C08G 64/305 (2013.01); C08G 18/44 (2013.01); C08G 64/0208 (2013.01); C08G 64/403 (2013.01);

Abstract

Provided is a method for producing an oligocarbonate polyol devoid of aromatic groups and phenolic functions, comprising a step of polycondensation by transesterification of monomers (A1) and/or dimers (A2) and of diol monomers (B1) and/or of triol monomers (B2), in a particular molar ratio, in order to obtain an oligocarbonate polyol having a molar mass of less than 5000 g/mol and at least two hydroxyl-type chain ends, the monomer (A1) corresponding to the following formula: (A1) and the dimer (A2) corresponding to the following formula: (A2) as well as the oligocarbonate polyol that can be obtained by this method and the polycarbonate that can be obtained by reacting this oligocarbonate with a polyisocyanate.

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