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AssigneeSolvay Engineered Polymers
InventorsXia Zhao, Hoan Tran, Charles G. Reid, Ruidong Ding
Estimating the term…
The melt strength is increased and the gloss level is reduced in olefinic TPE compositions through the addition of sufficient amounts of free radical generators (A) and co-curative agents (B). The free radical generators (A) include peroxides, organic peroxides, the persulfates, and the diazo compounds, and mixtures thereof. The co-curative agents (B) includes metal salts of alpha, beta-unsaturated carboxylic acids and alpha, beta-unsaturated carboxylic acids where the pending acid group has been neutralized, or mixtures thereof, and the metals for forming the metal salts of co-curative agent (B) include zinc, lithium, calcium, magnesium, sodium or aluminum, or mixtures thereof.
A modified olefinic thermoplastic elastomer composition formed by melt blending an olefinic thermoplastic elastomer with sufficient amounts of a free radical generator (A) and a co-curative agent (B) to promote crosslinking to a gel content of about 10 to 80%, wherein the olefinic thermoplastic elastomer and the modified olefinic thermoplastic elastomer composition each have a melt strength measured at a temperature of 220° C. and a surface gloss level, with the melt strength of the modified olefinic thermoplastic elastomer composition divided by the melt strength of olefinic thermoplastic elastomer before addition of the curative agents providing a ratio of about 1.5/1 to 20/1, and with the surface gloss level of the olefinic thermoplastic elastomer composition after addition of the curative agents (GL2) divided by the surface gloss level of the olefinic thermoplastic elastomer composition before addition of the curative agents (GL1) providing a ratio which is equal to or greater than 0.01 but equal to or less than 0.5, wherein the sufficient amounts are about 0.001 to 0.05 pph of free radical generator (A) and about 0.001 to 7.5 pph of co-curative agent (B).
A modified olefinic thermoplastic elastomer composition formed by melt blending an olefinic thermoplastic elastomer with sufficient amounts of a free radical generator (A) and a co-curative agent (B) to promote crosslinking to a gel content of about 10 to 80%, wherein the olefinic thermoplastic elastomer and the modified olefinic thermoplastic elastomer composition each have a melt strength measured at a temperature of 220° C. and a surface gloss level, with the melt strength of the modified olefinic thermoplastic elastomer composition divided by the melt strength of olefinic thermoplastic elastomer before addition of the curative agents providing a ratio of about 1.5/1 to 20/1, and with the surface gloss level of the olefinic thermoplastic elastomer composition after addition of the curative agents (GL2) divided by the surface gloss level of the olefinic thermoplastic elastomer composition before addition of the curative agents (GL1) providing a ratio which is equal to or greater than 0.01 but equal to or less than 0.5, wherein the sufficient amounts are about 0.001 to 0.04 pph of free radical generator (A) and about 0.001 to 7 pph of co-curative agent (B).
Dependencies are inferred from the claim text.