Aqueous dispersions of polyurethane having side chain polyoxyethylene units

• US 3,905,929 A
• Filed: 03/18/1974
• Issued: 09/16/1975
• Est. Priority Date: 03/23/1973
• Status: Expired due to Term

• Current Assignee: Klaus Noll
• Original Assignee: Klaus Noll
• Inventors: Noll, Klaus
• Primary Examiner(s): Bleutge, John C.
• Assistant Examiner(s): Koeckert, Arthur H.
• Application Number:
  US05/452,163
• Time in Patent Office: 547 Days
• Field of Search: 260/29.2TN
• US Class Current: 524/839
• CPC Class Codes: C08G 18/4009 Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
• CPC Class Codes: C08G 18/5042 containing ureum groups
• CPC Class Codes: D06M 15/564 Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
• CPC Class Codes: D06N 3/14 with polyurethanes

Abstract

A polyurethane adapted for making non-ionic aqueous polyurethane dispersions without an added emulsifier is prepared by reacting a conventional organic diisocyanate and an organic compound having groups reactive with isocyanato groups and having a side chain which contains repeating -O-CH2-Ch2 ) groups. Latices prepared from the polyurethane may be used to prepare films and coatings having improved physical properties.

Claims

1. A PROCESS FOR MAKING NON-IONIC AQUEOUS POLYURETHANE DISPERSIONS FREE FROM EMULSIFIER WHICH COMPRISES REACTING AN ORGANIC DIISOCYANATE AND AN ORGANIC COMPOUND WHICH IS DIFUNCTIONAL FOR THE PURPOSE OF AN ISOCYANATE POLYADDITION REACTION, CONTAINS TERMINAL HYDROGEN ATOMS WHICH ARE REACTIVE WITH ISOCYANATE GROUPS, HAS A MOLECULAR WEIGHT RANGE OF FROM ABOUT 500 TO ABOUT 6,000 AND IS FREE FROM SIDECHAIN POLYETHYLENE OXIDE UNITS AND WITH AN ORGANIC COMPOUND WHICH IS DIFUNCTIONAL FOR THE PURPOSE OF THE ISOCYANATE POLYADDITION REACTION, CONTAINS TERMINAL HYDROGEN ATOMS WHICH ARE REACTIVE WITH ISOCYANATE GROUPS AND CONTAINS SIDE CHAIN POLYETHYLENE OXIDE UNITS, SAID ORGANIC COMPOUND CONTAINING SIDE CHAIN POLYETHYLENE OXIDE UNITS HAVING THE FORMULA

2. A polyurethane dispersion prepared by the process of claim 1.

3. A process for producing thermoplastic non-ionic polyurethane elastomers which are dispersible in water and have a substantially linear molecular structure which comprises reacting an organic diisocyanate with an organic compound which is difunctional for the purpose of an isocyanate polyaddition reaction, contains terminal hydrogen atoms which are reactive with isocyanate groups, has a molecular weight of from about 500 to about 6,000 and is free from side chain polyethylene oxide units and with an organic compound which is difunctional for the purpose of an isocyanate polyaddition reaction and contains terminal hydrogen atoms which are reactive with isocyanato groups and side chain polyethylene oxide units, said compound containing side chain polyethylene oxide units having the general formula

4. The product of the process of claim 3.

5. A process for making a polyurethane which is adapted to be dispersed in water without an emulsifying agent which comprises reacting an organic diisocyanate with an organic compound having reactive hydrogens as determinable by the Zerewitinoff method and having a molecular weight of from about 500 to about 6,000 which is substantially free from units derived from ethylene oxide and a hydrophilic chain lengthening agent having the formula

6. The process of claim 1 wherein a difunctional organic compound having hydrogen atoms reactive with isocyanato groups, a molecular weight of below 500 and free from groups derived from ethylene oxide is included in the reaction mixture.

7. The process of claim 3 wherein a difunctional organic compound having hydrogen atoms reactive with isocyanato groups, a molecular weight of below 500 and free from groups derived from ethylene oxide is included in the reaction mixture.

8. The process of claim 5 wherein a difunctional organic compound having hydrogen atoms reactive with isocyanato groups, a molecular weight of below 500 and free from groups derived from ethylene oxide is included in the reaction mixture.

9. A process for making dispersions which comprises dispersing the product of claim 5 in water.