Polyurethane and process for preparing same

Details Polyurethane and process for preparing same Polyurethane and process for preparing same

1989-03-16

1991-01-22

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carbohydrate or derivative as a reactant

527401, 521159, 521160, 521161, 521162, C08G 1800, C08G 5900

Patent

active

049872133

ABSTRACT:
A new polyurethane as well as a process for preparing same is disclosed. The new polyurethane contains therein a hard segment derived from at least one polyhydroxy substance selected from the group consisting of cellulosic substances, hemi-cellulosic substances and lignic substances, and is excellent in mechanical and thermal characteristics as compared with the existing polyurethanes. The new polyurethane can be prepared according to a method known per se, using the polyhydroxy substance alone or in mixture with a polyol compound as reactants to be polycondensed with a polyisocyanate.

REFERENCES:
patent: 3519581 (1970-07-01), Moorer et al.
patent: 4032483 (1977-06-01), Hartman
patent: 4855184 (1989-08-01), Klun et al.
patent: 4861629 (1989-08-01), Nahm
Lignins: Properties and Materials, Chapter 24, "Organosolv Lignin-Modified Phenolic Resins", 1989, American Chemical Society, pp. 324-328.
Proceedings of the International Symposium on Wood Pulping Chemistry, "The Ekman Days", vol. 3, Stockholm, Jun. 9-12, 1981.
Fengel et al., Wood Chemistry, Ultrastructure, Reactions; Walter de Gruyter, Berlin, 1984.

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