Polyurethane pressure-sensitive adhesives
Assignee3M Innovative Properties Company
InventorsYongshang LU, Charlie Chia-Tie HO
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Abstract
A crosslinkable composition is provided including an asymmetric isocyanate, a polyther polyol, and a crosslinker. Polyurethane pressure-sensitive adhesives, articles, and solutions are also provided. The polyurethane pressure-sensitive adhesives have advantageous adhesive properties, low glass transition temperatures, and cohesion following thermal cycling.
Claims17
(canceled)
The pressure-sensitive adhesive of claim 12, wherein the isocyanate comprises 1-isocyanatomethyl-3-isocyanato-1,5,5-trimethylcyclohexane (isophorone diisocyanate), 1,3-bis(2-isocyanatopropan-2-yl)benzene (tetramethylxylene diisocyanate), 1-methyl-2,4-diisocyanatocyclohexane, 1,6-diisocyanato-2,2,4-trimethylhexane, 1,6-diisocyanato-2,4,4-trimethylhexane, 5-isocyanato-1-(2-isocyanatoeth-1-yl)-1,3,3-trimethylcyclohexane, 5-isocyanato-1-(3-isocyanatoprop-1-yl)-1,3,3-trimethylcyclohexane, 5-isocyanato-1-(4-isocyanatobut-1-yl)-1,3,3-trimethylcyclohexane, 1-isocyanato-2-(3-isocyanatoprop-1-yl)cyclohexane, 1-isocyanato-2-(2-isocyanatoeth-1-yl)cyclohexane, dicyclohexylmethane 2,4′-diisocyanate, 2-heptyl-3,4-bis(9-isocyanatononyl)-1-pentylcyclohexane, ethylethylene diisocyanate, or a combination thereof.
The pressure-sensitive adhesive of claim 12, wherein the isocyanate comprises a chlorinated diisocyanate, a brominated diisocyanate, a sulphur-containing diisocyanate, a phosphorus-containing diisocyanate, or a combination thereof.
The pressure-sensitive adhesive of claim 12, wherein the isocyanate comprises isophorone diisocyanate, tetramethylxylene diisocyanate, or a combination thereof.
(canceled)
The pressure-sensitive adhesive of claim 12, wherein the chain extender comprises 3-methyl-1,5-pentanediol, 1,4-butanediol, ethylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexane dimethanol, bis(2-hydroxylethyl)hydroquinone (HQEE), or a combination thereof.
The pressure-sensitive adhesive of claim 12, wherein the crosslinker is present in an amount of 1 mole percent to 35 mole percent of the OH groups of the crosslinker.
(canceled)
The pressure-sensitive adhesive of claim 12, wherein the crosslinker comprises TMP.
The pressure-sensitive adhesive of claim 12, comprising 1.0 mole percent to 40 mole percent of the polyether polyol.
The pressure-sensitive adhesive of claim 12, wherein the polyether polyol has an average molecular weight of about 1,000 grams/mole to 5,000 grams/mole.
A pressure-sensitive adhesive comprising the crosslinked composition of a crosslinkable composition comprising:
- (a) 40 mole percent to 55 mole percent of an asymmetric isocyanate:
- (b) a polyether polyol;
- (c) a crosslinker comprising 1,2,6-hexanetriol, glycerol, 1,1,1-trimethylolethane, 1,1,1-trimethylolpropane (TMP), pentaerythritol, triisopropanol amine, triethanol amine, a TMP initiated branched adipate polyol, a TMP initiated branched phthalate polyol, a glycerol initiated branched adipate polyol, or a glycerol initiated branched phthalate polyol;
- and
- (d) 1 mole percent to 40 mole percent of a chain extender;
- wherein the polyether polyol and the crosslinker are present in an amount of 45 mole percent to 60 mole percent of the total OH groups of the polyether polyol and the crosslinker together.
Dependencies are inferred from the claim text.