Product assembly adhesives comprising low volatile tackifier compositions
A tackifier composition comprising at least one thermoplastic hydrocarbon resin and an antioxidant composition is provided; wherein a portion of the volatile organic compounds in the thermoplastic hydrocarbon resin has been removed; wherein the antioxidant composition comprises at least one primary antioxidant and at least one secondary antioxidant; and wherein the levels of individual volatile organic compound monitored in the tackifier composition are less than about 0.5 ppm as measured by GC/MS headspace analysis. Processes for producing the tackifier composition are also provided as well as adhesives comprising the tackifier compositions.
1. A product assembly hot melt adhesive composition, comprising:
about 5 parts to about 90 parts of at least at least one base polymer comprising at least one amorphous polyolefin,
about 5 parts to about 90 parts of at least one tackifier composition comprising at least one thermoplastic hydrocarbon resin and an antioxidant composition, wherein a portion of the volatile organic compounds in the thermoplastic hydrocarbon resin has been removed,
about 0 parts to about 50 parts of at least one plasticizing oil,
about 0 parts to about 50 parts of at least one wax,
about 0 parts to about 80 parts of at least one filler, and
at least one additional antioxidant;
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, then 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 said thermoplastic hydrocarbon resin is a fully hydrogenated or partially hydrogenated C9 resin; and
wherein the levels of individual volatile organic compounds in the tackifier composition are less than about 0.5 ppm as measured by GC/MS headspace analysis.
2. The product assembly hot melt adhesive composition according to claim 1 , wherein said thermoplastic hydrocarbon resin has a Rolling Ball softening point between about 70° C. and about 150° C.
3. The product hot melt adhesive composition according to claim 1 , wherein said primary antioxidant is the sterically hindered phenol and is selected from one or more of the group consisting of (CI)-(CXIX):
4. The product assembly hot melt adhesive composition according to claim 1 , wherein said secondary antioxidant is the hydroxyl-amine.
5. The product assembly hot melt adhesive composition according to claim 1 , wherein said secondary antioxidant is the organo-phosphite and is selected from the group consisting of 2,2′,T-Nitrilo[triethyl-[3,3,5,5-tetra-tert.-butyl-1,1-biphenyl-2,2-diyl] phosphite (CAS 80410-33-9); Bis-(2,4-ditert.-butylphenol)pentaerythritol diphosphate (CAS 26741-53-7); Tris(2,4-di-tert.butyl phenyl) phosphite (CAS 31570-04-4); Tetrakis(2,4-di-tert-butylphenyl)[1, 1-biphenyl]-4,4′-diylbisphosphonite (CAS 119345-01-6); and Tri-(nonylphenol)-phosphite.
6. The product assembly hot melt adhesive composition according to claim 1 , wherein said secondary antioxidant is at least one selected from the group consisting of didodecyl-3,3′-thiodipropionate (CAS 123-28-4) and 3,3′-Thiodipropionic acid dioctadecylester (CAS 693-36-7).
7. The product assembly hot melt adhesive composition according to claim 4 , wherein said hydroxyl-amine are oxidized bis(hydrogenated tallow alkyl) amine (CAS: 143925-92-2).
8. The product assembly hot melt adhesive composition according to claim 1 , wherein said HALS is at least one selected from the group consisting of (A1)-(AX):
9. The product assembly hot melt adhesive composition according to claim 1 , wherein said HALS is present in an amount of about 0.05% to about 0.5% by weight based on the weight of said thermoplastic hydrocarbon resin.
10. The product assembly hot melt adhesive composition according to claim 1 , wherein said primary antioxidant is pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) and said HALS is bis(2,2,6,6,-tetramethyl-4-piperidyl) sebacate.
11. An article comprising the product assembly hot melt adhesive composition of claim 1 .
12. The product assembly hot melt adhesive composition according to claim 1 , wherein said at least one additional antioxidant is present in an amount of at least about 1 part by weight.
13. The product assembly hot melt adhesive composition according to claim 1 , wherein said at least one additional antioxidant is present in an amount of about 0.2 to 1 part by weight.
14. The product assembly hot melt adhesive composition according to claim 1 , wherein said primary antioxidant is pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), wherein said HALS is bis(2,2,6,6,-tetramethyl-4-piperidyl) sebacate, and wherein said thermoplastic hydrocarbon resin is C9 thermoplastic resin.