Polyurethanes and polyurethane/polyureas crosslinked using 2-glyceryl acrylate or 2-glyceryl methacrylate
AssigneeMinnesota Mining and Manufacturing Company
InventorsW. James Hammar, John S. Staral
Life of this patent
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Abstract
A crosslinkable polyurethane or polyurethane/polyurea comprises the reaction product of a composition comprising a macrodiol or macrodiamine, 2-gl;yceryl acrylate or 2-glyceryl methacrylate, a diisocyanate, and optionally a small glycol or small diamine as chain extender. The performance properties of the polyurethanes and polyurethane/polyureas can be controlled by adjustment of the crosslink level and/or curing parameters.
Claims30
A crosslinkable polyurethane or polyurethane/polyurea comprising the reaction product of a composition comprising a macrodiol having a number average molecular weight of at least 400 or macrodiamine having a number average molecular weight of at least 400, 2-glyceryl acrylate or 2-glyceryl methacrylate, and a diisocyanate.
A crosslinkable polyurethane or polyurethane/polyurea having randomly disposed units of the formula ##STR9## wherein:
- X is --NH-- or --O--,
- R.sup.1 is a polyether, a polyester, or a polydimethylsiloxane segment,
- R.sup.2 and R.sup.4 independently are selected from the class consisting of alkylene, cycloalkylene, and arylene groups and combinations thereof
- R.sup.3 is H or CH.sub.3, and
- A, B, D=total number of OH and NH equivalents and the total molecular weight of the A, B, and D units is in the range of 10,000 to 400,000.
A method comprising the step of
- (a) reacting a macrodiol having a number average molecular weight of at least 400 or macrodiamine having a number average molecular weight of at least 400, a diisocyanate, and 2-glyceryl acrylate or 2-glyceryl methacrylate to provide a crosslinkable polyurethane or polyurethane/polyurea.
A method for adjusting the crosslinking of polyurethanes or polyurethane/polyureas comprising the steps of:
- (a) providing a crosslinkable polyurethane or polyurethane/polyurea having chain extender units of the formula ##STR10## wherein R is hydrogen or methyl, and (b) crosslinking said polyurethane via at least one of thermal energy, ultraviolet radiation, gamma radiation or electron beam radiation.
Dependencies are inferred from the claim text.