Back to results
US 6,605,680 B1Granted
Low color, aromatic modified C5 hydrocarbon resins
AssigneeEastman Chemical Resins, Inc.
InventorsChretien P. L. C. Donker, Ester E. C.G. Gielens, Gerard A. Verrijzer
Life of this patent
Estimating the term…
Abstract
Low color, aromatic modified C5 hydrocarbon resins are disclosed. The resins are predominantly an aromatic modified piperylene resin. The resins are useful as tackifiers in hot melt adhesives and hot melt pressure sensitive adhesives.
Claims15
A process for making a hydrocarbon copolymer resin having a Gardner color of less than about 4 and having a ring and ball softening point from about 85 to about 100° C. comprising:
- (a) providing a first predominantly C5 hydrocarbon component comprising unsaturated aliphatic monomers, said unsaturated aliphatic monomers comprising a combination of piperylene monomers, less than about 2% weight cyclopentadiene and dicyclopentadiene monomers and less than about 1% weight isoprene;
- (b) providing a second hydrocarbon component comprising a monovinyl aromatic C8 to C12 monomer;
- (c) combining said components to obtain a weight ratio of said unsaturated aliphatic monomers to said monovinyl aromatic C8 to C12 monomers from about 1.5/1 to about 25/1;
- (d) polymerizing said combined components at a temperature from about 25 to about 75° C.;
- and
- (e) recovering said copolymer resin, wherein said copolymer resin has a Mz from about 2500 to about 4000 daltons and a polydispersity of about 1.7 to 2.0.
3 more elements
The process of claim/wherein said copolymer resin has a Mz from about 2700 to about 4000 daltons and a polydispersity of about 1.7 to about 2.0.
Dependencies are inferred from the claim text.