Sulfur plasticization with olefins
AssigneeSuntech, Inc.
InventorRichard D. Cassar
Life of this patent
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Abstract
A process for plasticizing sulfur to obtain a flexible, elastomeric product by reacting a mixture of dicyclopentadiene and a second cyclic diene or a di- or triolefinic terpene with sulfur.
Claims14
A process for plasticizing sulfur to obtain a flexible, elastomeric material which consists essentially of adding to sulfur with thorough mixing at a temperature of from about 115.degree. to about 160.degree. C. from about 10% to about 50% by weight of said sulfur a mixture of dicyclopentadiene and an olefinic material selected from the group of (1) an unsaturated bridge-ring hydrocarbon containing at least two double bonds, (2) a cyclic or acyclic di- or triolefinic terpene, and (3) a hydrocarbon where a cyclic diene is fused to an aromatic ring, wherein said bridge-ring hydrocarbon is selected from the group consisting of:
- (a) unsaturated derivatives of bicyclo[2.2.1]heptane, contaning at least two double bonds,
- (b) unsaturated derivatives of bicyclo[2.2.2]octane containing at least two double bonds,
- (c) unsaturated derivatives of bicyclo[3.2.1.]octane containing at least two double bonds,
- (d) unsaturated derivatives of bicyclo[3.3.1]nonane containing at least two double bonds, and
- (e) unsaturated derivatives of bicyclo[3.2.2]nonane containing at least two double bonds;
- wherein said cyclic or acyclic di- or triolefin terpene is selected from the group consisting of:
- dipentene, .psi.-limonene, 3,8-p-menthadiene, .alpha.- and .beta.-phellandiene, .alpha.- and .gamma.-terpinene, terpinolene, isoterpinolene, myrcene, ocimene, alloocimene, p-cymene, .alpha.- and .beta.-caryophyllene,
- wherein said hydrocarbon with a cyclic diene fused to an aromatic ring is selected from the group consisting of indene, acenaphthalene and azulene, and wherein the weight ratio of said dicyclopentadiene to said olefinic material is from about 25:75 to about 75:25.
A flexible, plasticized sulfur composition obtained by adding with agitation a mixture of dicyclopentadiene and an olefinic material to molten sulfur held at a temperature of from about 115.degree. to about 160.degree. C., the weight ratio of the mixture of dicyclopentadiene to olefinic material being from about 25:75 to about 75:25, the amount of said mixture being added to said sulfur being from about 10% to about 50% by weight of said sulfur, and said olefinic material being selected from the group of (1) an unsaturated bridge-ring hydrocarbon containing at least two double bonds, (2) a cyclic or acyclic di- or triolefinic terpene, and (3) a hydrocarbon where a cyclic diene is fused to an aromatic ring, wherein said bridge-ring hydrocarbon is seleced from the group consisting of:
- (a) unsaturated derivatives of bicyclo[2.2.1]heptane, containing at least two double bonds,
- (b) unsaturated derivatives of bicyclo[2.2.2]octane containing at least two double bonds,
- (c) unsaturated derivatives of bicyclo[3.2.1.]octane containing at least two double bonds,
- (d) unsaturated derivatives of bicyclo[3.3.1]nonane containing at least two double bonds, and
- (e) unsaturated derivatives of bicyclo[3.2.2]nonane containing at least two double bonds;
- wherein said cyclic or acyclic di- or triolefinic terpene is selected from the group consisting of:
- dipentene, -limonene, 3,8-p-menthadiene, .alpha.- and .beta.-phellandiene, .alpha.- and .gamma.-terpinene, terpinolene, isoterpinolene, myrcene, ocimene, alloocimene, p-cymene, .alpha.- and .beta.-caryophyllene and
- wherein said hydrocarbon with a cyclic diene fused to an aromatic ring is selected from the group consisting of indene, acenaphthalene and azulene.
Dependencies are inferred from the claim text.