Compositions containing rosin esters and ethylene polymers
First Claim
1. A composition comprising,(a) a polymer derived from ethylene polymer derived from at least one polar monomer with one or more ester groups, which polymerize with ethylene, and(b) a rosin ester having a hydroxyl number of seven or less, an Mz value between 2500 and 12000 and less than 800 ppm sulfur,wherein the rosin ester is obtained byesterifying a rosin andstripping off volatiles.
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Accused Products
Abstract
Disclosed are compositions which include an ethylene polymer derived from at least one polar monomer with one or more ester groups, which polymerize with ethylene, (e.g., a copolymer, or low molecular weight copolymer having a relatively high melt index, derived from ethylene and vinyl acetate and/or a copolymer, or low molecular weight copolymer having a relatively high melt index, derived from ethylene and «-buty! acrylate) and a rosin ester. The rosin ester can have a low hydroxy! number (e.g., a hydroxy! number six or five or less), a low acid number (e.g., an acid number of ten or less), a relatively low PAN number (e.g., a PAN number less than twenty-two or in between eight and twenty), a relatively high third moment or third power average molecular weight (Mz), (e.g., an Mz value in between 2500 and 12000 g/mol), a low sulfur content (e.g., a sulfur content lower than 600 ppm prior to antioxidant addition) or combinations thereof. The compositions can exhibit a high heat stress resistance (e.g., a heat stress pass temperature value higher than 52° C. or in between 48° C. and 60° C.) and/or improved viscosity stability and/or color stability upon thermal aging and/or improved compatibility.
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Citations
19 Claims
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1. A composition comprising,
(a) a polymer derived from ethylene polymer derived from at least one polar monomer with one or more ester groups, which polymerize with ethylene, and (b) a rosin ester having a hydroxyl number of seven or less, an Mz value between 2500 and 12000 and less than 800 ppm sulfur, wherein the rosin ester is obtained by esterifying a rosin and stripping off volatiles.
Specification