US 12,486,424 B2
Stretchable multilayer films
Sunil Vilas Kulkarni, Kingsport, TN (US); Thomas Joseph Pecorini, Kingsport, TN (US); Jamie Sue Dziczkowski, Kingsport, TN (US); John Evan Boisseau, Bonita Springs, FL (US); and Babatunde Samuel Olaiya, Greensboro, NC (US)
Assigned to Eastman Chemical Company, Kingsport, TN (US)
Appl. No. 18/253,899
Filed by EASTMAN CHEMICAL COMPANY, Kingsport, TN (US)
PCT Filed Nov. 16, 2021, PCT No. PCT/US2021/059432
§ 371(c)(1), (2) Date May 22, 2023,
PCT Pub. No. WO2022/115268, PCT Pub. Date Jun. 2, 2022.
Claims priority of provisional application 63/119,273, filed on Nov. 30, 2020.
Prior Publication US 2024/0018383 A1, Jan. 18, 2024
Int. Cl. C09D 167/02 (2006.01); B32B 27/36 (2006.01); B32B 27/40 (2006.01)
CPC C09D 167/02 (2013.01) [B32B 27/36 (2013.01); B32B 27/40 (2013.01)] 20 Claims
 
1. A stretchable, multilayer film comprising:
a thermoplastic polyurethane substrate; and
a thermoset coating, applied to the thermoplastic polyurethane substrate, comprising the reaction product of:
i) an oligomeric polyester resin comprising the reaction product of:
a. diols or polyols comprising from about 30 to about 99 mol % trimethylolpropane and from about 1 mol % to about 70 mol % neopentyl glycol, in each case based on the total molar amount of diols and polyols reacted, and
b. dicarboxylic acids or polycarboxylic acids comprising from about 1 mol % to about 70 mol % of one or more cyclic or acyclic aliphatic acids having from 2 to 12 carbons, based on the total molar amount of dicarboxylic acids and polycarboxylic acids reacted,
wherein the oligomeric polyester resin has a glass transition temperature (Tg) of −40 to 55° C., an acid number of 0 to 15 mgKOH/g, a hydroxyl number of 100 to 370 mgKOH/g, a number average molecular weight of 500 to 10,000 mgKOH/g, and a weight average molecular weight of 1000 to 40,000; and
(ii) an aliphatic isocyanate, isocyanurate, allophanate, or biuret,
wherein the stretchable, multilayer film exhibits an elongation to break of greater than 50%, has a load/inch to stretch of less than 2 lbs/in at 5% strain when measured within a week of multilayer film preparation, and has Tree Sap resistance of greater than 45° C.