Method for thickening aqueous systems using hydrophilic...

Details Method for thickening aqueous systems using hydrophilic... Method for thickening aqueous systems using hydrophilic...

2005-09-13

2005-09-13

Gorr, Rachel (Department: 1711)

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C524S591000, C516S071000

Reexamination Certificate

active

06943230

ABSTRACT:
A method for increasing an adhesive to a substrate is disclosed which utilizes a hydrophilic, high molecular weight, nonionic polyurethane adhesive. The polyurethane adhesive is soluble in water and a 1% by weight solution of the adhesive in water at 20% has a specific viscosity of at least 0.4. The nonionic polyurethane contains the following structural units:a) —O—(CH2—CH2O)nwhere n is 8 to 500;b) —CO—NH—X—NHCO— where X is an aliphatic or cycloaliphatic group; andc) —O—Y—O— wherein Y comprises a hydrophobic moiety from the groups(—CH2—CH(CH3)—O)m—CH2—CH(CH3)—,(—CH2CH(C2H5)—O)m—CH2—CH(C2H5)—,(—CH2—CH2—CH2—CH2O)m—CH2CH2CH2CH2—,alkylene groups having from 2 to 44 carbon atoms, cycloalkylene groups having from 6 to 44 carbon atoms and mixtures thereof.

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