TWO-COMPONENT COMPOSITION
A two-component composition comprises component A and component B. Component A comprises a reaction product obtained by reacting at least an aliphatic polyisocyanate and a crystalline polyester polyol having a number average molecular weight of less than 3000 g/mol. Component B comprises at least one polyester polyol, a chain extender, and a silane coupling agent. The composition can be used as an adhesive to manufacture an article having a bonding strength value after sterilization greater than or equal to 3.5 N/15 mm. A multilayer film comprises at least two layers of substrates bonded together by a continuous layer, wherein the continuous layer consists of the two-component composition. The multilayer film can be used to manufacture flexible packaging intended for sterilization treatments.
1 - 15 . (canceled)
16 . A two-component composition comprising:
a component A comprising a reaction product obtained by reacting at least:
an aliphatic polyisocyanate, and
a crystalline polyester polyol having a number average molecular weight of less than 3000 g/mol; and
a component B comprising:
at least one polyester polyol,
a chain extender, and
a silane coupling agent.
17 . The two-component composition according to claim 16 , wherein the aliphatic polyisocyanate is selected from isophorone diisocyanate (IPDI), dicyclohexylmethane 4,4′-diisocyanate (H12MDI), 1,4-cyclohexylene diisocyanate, 1,2-cyclohexylene diisocyanate, 2,4-diisocyanato-1-methylcyclohexane, 1,3-diisocyanato-2-methylcyclohexane, meta-xylylene diisocyanate (m-XDI), hydrogenated meta-xylylene diisocyanate (m-H6XDI), tetramethylxylene diisocyanate (TMXDI), 1,2-ethylene diisocyanate, 1,3-propylene diisocyanate, 1,4-butylene diisocyanate, 1,5-pentamethylene diisocyanate (PDI), 1,6-hexamethylene diisocyanate (HDI), and mixtures thereof.
18 . The two-component composition according to claim 16 , wherein the crystalline polyester polyol in component A is obtained by reacting:
a polycarboxylic acid selected from succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, fumaric acid or dimer thereof, maleic acid or dimer thereof, 1,4-cyclohexanedicarboxylic acid, isophthalic acid, phthalic acid, terephthalic acid, ester-forming derivatives thereof and mixtures thereof, and
a polyol selected from ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, neopentylglycol, bisphenol A, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol and mixtures thereof.
19 . The two-component composition according to claim 16 , wherein the reaction product in component A is obtained by reacting the aliphatic polyisocyanate and the crystalline polyester polyol at least also with a polyether polyol.
20 . The two-component composition according to claim 4 , wherein the polyether polyol is selected from polyethylene glycol, polypropylene glycol, poly(tetramethylene ether) glycol (PTMEG) and copolymers thereof.
21 . The two-component composition according to claim 16 , wherein the reaction product in component A is obtained by reacting the aliphatic polyisocyanate and the crystalline polyester polyol at least also with a low molecular weight polyol.
22 . The two-component composition according to claim 16 , wherein the reaction product in component A is obtained by reacting the aliphatic polyisocyanate and the crystalline polyester polyol at least also with a silane coupling agent.
23 . The two-component composition according to claim 16 , wherein the polyester polyol in component B is obtained by reacting:
a polycarboxylic acid selected from succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, fumaric acid or dimer thereof, maleic acid or dimer thereof, 1,4-cyclohexanedicarboxylic acid, isophthalic acid, phthalic acid, terephthalic acid, ester-forming derivatives thereof and mixtures thereof, and
a polyol selected from ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, trimethylolpropane, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, neopentylglycol, bisphenol A, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol and mixtures thereof,
optionally with at least one fatty acid and/or triglyceride(s) thereof comprising a fatty acid comprising one or more hydroxy groups.
24 . The two-component composition according to claim 16 , wherein the component B comprises at least two polyester polyols.
25 . The two-component composition according to claim 16 , wherein the chain extender in component B is selected from 1,4-butanediol, ethylene glycol, diethylene glycol, 1,6-hexanediol, 1,2,3-propanetriol, trimethylolethane, trimethylolpropane, 1,2,6-hexanetriol, triethanolamine, diethanolamine, ethanolamine and mixtures thereof.
26 . The two-component composition according to claim 16 , wherein the silane coupling agent in component B is an amino-silane compound.
27 . The two-component composition according to claim 16 , being free of primary aromatic amines.
28 . An adhesive comprising the two-component composition according claim 16 , wherein the adhesive has a bonding strength value after sterilization greater than or equal to 3.5 N/15 mm.
29 . Multilayer film comprising at least two layers of substrates bonded together by a continuous layer, wherein said continuous layer consists of the two-component composition according to claim 16 .
30 . Flexible packaging intended configured for sterilization treatments, the packaging comprising the multilayer film according to claim 29 .