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1. WO2016099937 - ADHÉSIFS DE POLYURÉTHANE SENSIBLES À LA PRESSION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

What is claimed is:

1. A crosslinkable composition comprising:

(a) 40 mole percent to 55 mole percent of an asymmetric isocyanate;

(b) a polyether polyol; and

(c) 5 mole percent to 40 mole percent of a crosslinker;

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.

2. The crosslinkable composition of claim 1, 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.

3. The crosslinkable composition of claim 1 or claim 2, wherein the isocyanate comprises a chlorinated diisocyanate, a brominated diisocyanate, a sulphur-containing diisocyanate, a phosphorus-containing diisocyanate, or a combination thereof.

4. The crosslinkable composition of claim 1 or claim 2, wherein the isocyanate comprises isophorone diisocyanate, tetramethylxylene diisocyanate, or a combination thereof.

5. The crosslinkable composition of any of claims 1 to 4, further comprising 1 mole percent to 40 mole percent of a chain extender.

6. The crosslinkable composition of claim 5, 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.

7. The crosslinkable composition of claim 5 or claim 6, wherein the crosslinker is present in an amount of 1 mole percent to 35 mole percent of the OH groups of the crosslinker.

8. The crosslinkable composition of any of claims 1 to 7, wherein the crosslinker comprises 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.

9. The crosslinkable composition of any of claims 1 to 8, wherein the crosslinker comprises TMP.

10. The crosslinkable composition of any of claims 1 to 9, comprising 1.0 mole percent to 40 mole percent of the polyether polyol.

11. The crosslinkable composition of any of claims 1 to 10, wherein the polyether polyol has an average molecular weight of about 1,000 grams/mole to 5,000 grams/mole.

12. A pressure-sensitive adhesive comprising the crosslinked composition of any of claims 1 to 11.

13. The pressure-sensitive adhesive of claim 12, wherein the crosslinked composition comprises an amorphous structure.

14. The pressure-sensitive adhesive of claim 12 or claim 13, wherein the adhesive has a haze of less than 2 %.

15. The pressure-sensitive adhesive of any of claims 12 to 14, wherein the adhesive has an adhesive shear modulus at -25°C of 0.1 × 107 dyne/cm2 to 20 × 107 dyne/cm2.

16. An adhesive article comprising the crosslinked composition of any of claims 1 to 11 and a flexible backing layer.