Method of preparing polymers with low melt viscosity
OwnerBrian J. Jenseninventor
Life of this patent
Estimating the term…
Abstract
This invention is an improvement in standard polymerizations procedures, i.e., addition-type and step-growth type polymerizations, wherein momomers are reacted to form a growing polymer chain. The improvement includes employing an effective amount of a trifunctional monomer (such as a trifunctional amine, anhydride, or phenol) in the polymerization procedure to form a mixture of polymeric materials consisting of branced polymers, star-shaped polymers, and linear polymers. This mixture of polymeric materials has a lower melt temperature and a lower melt viscosity than corresponding linear polymeric materials of equivalent molecular weight.
Claims9
In the process for the preparation of polyimides, in which diamines are reacted with dianhydrides in a solvent to prepare poly(amide) acids, which are then converted to corresponding polyimides, the improvement therein which comprises employing an effective amount of a trifunctional amine or anhydride monomer in the process to form an effective amount of a member selected from the group consisting of branched poly(amide) acids and star-shaped poly(amide) acids, which are then converted to the corresponding branched polyimides and star-shaped polyimides respectively, providing a mixture of polyimides having a lower melt temperature and a lower melt viscosity than corresponding linear polyimides of equivalent molecular weight.
Dependencies are inferred from the claim text.