Aqueous poly(urea/urethanes) dispersions using polyester glycol

• US 7,589,149 B2
• Filed: 11/04/2003
• Issued: 09/15/2009
• Est. Priority Date: 11/04/2002
• Status: Expired due to Fees

• Current Assignee: Invista North America Sarl (Invista)
• Original Assignee: Invista North America Sarl (Invista)
• Inventors: O'Neil, Michael, Kim, Young H., Chen, Jiazhong
• Primary Examiner(s): Niland; Patrick D
• Application Number:
  US10/701,317
• Publication Number:
  US 20040171745A1
• Time in Patent Office: 2,142 Days
• Field of Search: 524/589, 524/590, 524/591, 524/839, 524/840, 528/44, 528/65, 528/85, 528/60, 528/66, 528/71, 528/80, 528/83, 528/84
• US Class Current: 524/591
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/302 Water
• CPC Class Codes: C08G 18/6659 with compounds of group C08G18/34
• CPC Class Codes: C08G 18/7671 containing only one alkylene bisphenyl group
• CPC Class Codes: C09D 175/04 Polyurethanes

Abstract

Stable aqueous poly(urea/urethane) polymers and dispersions are made that do not require the inclusion of chain extenders, curing agents or crosslinking agents.

Claims

1. An ionomeric urea/urethane polymer comprising (a) repeating units derived from an aliphatic polyester polyol, and (b) repeating units derived from a polyisocyanate,

wherein the urea/urethane polymer contains less than about 2 mole percent of urea units described by the formula —

R—

N(R²)—

C(O)—

N(R²)—

R¹;

wherein R is a C₆-C₂₀ aromatic hydrocarbon radical, R¹ is a C₁-C₂₀ aliphatic hydrocarbon radical, and R² is H or an amide group that is described by the formula C(O)—

N(R²)—

R—

; and

wherein the polyisocyanate is selected from the group consisting of toluene diisocyanate, methylene diphenyldiisocyanate, polymethylene polyphenylisocyanate, and mixtures thereof.

2. A urea/urethane polymer according to claim 1 which comprises repeating units derived from an ionic compound or a potentially ionic compound.

3. A urea/urethane polymer according to claim 2 wherein the ionic compound or potentially ionic compound comprises a hydroxy-carboxylic acid of the general formula (HO)_xR⁷(COOH)_y, wherein R⁷ represents a straight or branched hydrocarbon radical containing 1 to 12 carbon atoms, and x and y each independently represents values from 1 to 3.

4. A urea/urethane polymer according to claim 2 wherein the ionic compound or potentially ionic compound comprises 2,2′

dimethanolpropionic acid.

5. A urea/urethane polymer according to claim 1 wherein the polyester polyol is a dihydroxy-terminated polymer selected from the group consisting of an ethylene adipate, a butylene adipate, an ethylene/butylene adipate, and mixtures thereof.

6. A urea/urethane polymer according to claim 1 wherein the urea/urethane polymer contains less than about 1 mole percent of the described urea units.

7. An aqueous dispersion of a urea/urethane polymer wherein the urea/urethane polymer comprises a polymer according to claim 1 and a surfactant.