CPC C09J 7/35 (2018.01) [A61L 15/20 (2013.01); A61L 15/225 (2013.01); A61L 15/585 (2013.01); C08K 3/013 (2018.01); C08K 5/0016 (2013.01); C08K 5/13 (2013.01); C08K 5/1345 (2013.01); C08K 5/17 (2013.01); C08K 5/3435 (2013.01); C08K 5/3492 (2013.01); C08K 5/372 (2013.01); C08K 5/375 (2013.01); C08K 5/52 (2013.01); C08K 5/5393 (2013.01); C08L 23/0853 (2013.01); C08L 23/26 (2013.01); C08L 53/02 (2013.01); C08L 91/06 (2013.01); C09J 7/381 (2018.01); C09J 11/06 (2013.01); C09J 11/08 (2013.01); C09J 123/0815 (2013.01); C09J 123/0853 (2013.01); C09J 123/26 (2013.01); C09J 153/00 (2013.01); C09J 153/02 (2013.01); C08K 5/005 (2013.01); C08K 5/105 (2013.01); C08K 5/12 (2013.01); C08K 5/34926 (2013.01); C09J 2301/408 (2020.08); C09J 2301/414 (2020.08); C09J 2453/00 (2013.01)] | 13 Claims |
1. A process for making a tackifier composition, said process comprising the following steps performed in the following order:
(a) polymerization of one or more monomers to form at least one partially or fully hydrogenated thermoplastic hydrocarbon resin;
(b) removing at least a portion of volatile organic compounds from the at least one thermoplastic hydrocarbon resin; and
(c) adding an antioxidant composition to said at least one thermoplastic hydrocarbon resin;
wherein the antioxidant composition comprises at least one primary antioxidant, at least one secondary antioxidant, and at least one hindered amine light stabilizer (HALS);
wherein said primary antioxidant is a hindered phenolic antioxidant or a secondary arylamine, and wherein said primary antioxidant is present in an amount of about 0.1% to about 1% based on the weight of the thermoplastic hydrocarbon resin;
wherein said secondary antioxidant is an organo-phosphite or a hydroxyl-amine, and wherein said secondary antioxidant is present in an amount of about 0.1% to about 1% based on the weight of said thermoplastic hydrocarbon resin;
wherein when said primary antioxidant is a hindered phenolic antioxidant, said secondary antioxidant is a hydroxyl-amine;
wherein when said secondary antioxidant is an organo-phosphite, then said primary antioxidant is a secondary arylamine;
wherein the antioxidant composition is added to the at least one thermoplastic resin both before and after step (b) to produce the tackifier composition;
wherein the levels of individual volatile organic compound in the tackifier composition are less than about 0.5 ppm as measured by GC/MS headspace analysis; and
wherein the amount of said HALS ranges from about 0.05% to about 0.5% by weight based on the weight of said at least one thermoplastic hydrocarbon resin.
|