Particulate aqueous polyurethane dispersion and process for prod

Details Particulate aqueous polyurethane dispersion and process for prod Particulate aqueous polyurethane dispersion and process for prod

1997-08-19

1999-09-28

Sergent, Rabon

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524500, 524501, 524591, 524839, 524840, 525902, 528 71, C08L 7504, C08L 7506, C08L 7508, C08G 1812

Patent

active

059590033

ABSTRACT:
The present invention provides particulate aqueous polyurethane dispersions and a process for producing the same. Two diverse polyols are reacted with two different amount of hydrophilic group-containing dihydric alcohols to obtain a hydrophobic prepolymer and a hydrophilic prepolymer respectively, and the two prepolymers obtained are together dispersed in water. After chain-extending the dispersed prepolymers, core-shell aqueous polyurethane dispersions are produced, wherein the shell is made from the hydrophilic prepolymer and the core is made from the hydrophobic prepolymer. The polyurethane product made from the aqueous polyurethane dispersions of the invention has superior solvent resistance and can be employed in industrial coating or surface treatment of leather or textiles.

REFERENCES:
patent: 4608413 (1986-08-01), Nachtkamp et al.
patent: 5011885 (1991-04-01), Chen et al.
patent: 5500457 (1996-03-01), Sarkar et al.
patent: 5539018 (1996-07-01), Luhmann et al.
patent: 5618859 (1997-04-01), Maeyama et al.
patent: 5624747 (1997-04-01), Sarkar et al.

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