Natural rubber latex preservation
AssigneeBeneo-Orafti S.A.
InventorsKarl Booten, Amir Hashim Bin Yatim, Manroshan Singh
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Abstract
The Invention relates to a method for the preservation of natural rubber latex comprising the step of adding to natural latex at least one hydrophobically modified saccharide. The hydrophobically modified saccharide is preferably a hydrophobically modified fructan, a hydrophobically modified starch hydrolysate, or a mixture thereof. The invention further relates to a natural rubber latex containing a hydrophobically modified saccharide, and to vulcanized natural rubber products containing a hydrophobically modified saccharide.
Claims18
A method for the preservation of natural rubber latex, comprising adding to natural rubber latex at least one hydrophobically modified saccharide, wherein the hydrophobically modified saccharide is a hydrophobically modified fructan, a starch hydrolysate derivative, or mixtures thereof, whereby the starch hydrolysate derivate has formula [B](-M)s, wherein
- [B] represents a starch hydrolysate moiety with a dextrose equivalent (D.E.) value ranging from 2 to 47,
- (-M) represents a hydrophobic moiety, substituting at least one hydrogen atom of a hydroxyl group of [B], wherein (-M) is selected from the group consisting of:
- an alkylcarbamoyl radical of formula R1-NH—CO—,
- an alkenyl-carbamoyl radical of formula R2-NH—CO—,
- an alkylcarbonyl radical of formula R1-CO—,
- an alkenylcarbonyl radical of formula R2-CO—,
- an alkyl radical of formula R1-,
- an alkenyl radical of formula R2-, and
- a hydroxyalkyl radical of formula R3-,
- wherein:
- R1 represents a linear or branched alkyl group with 4 to 22 carbon atoms,
- R2 represents a linear or branched alkenyl group with 4 to 22 carbon atoms,
- R3 represents a linear or branched hydroxyalkyl group with 4 to 22 carbon atoms of formula —CHR′—CHOH—R″, wherein R′ is hydrogen or a linear or branched alkyl radical containing 2 to 20 carbon atoms;
- and R″ is a linear or branched alkyl radical containing 2 to 20 carbon atoms;
- and
- s represents the number of hydrophobic moieties (-M) attached to [B], expressed as the number average degree of substitution (av. DS) per individual fructosyl and/or glucosyl unit and ranging from 0.01 to 2.0.
A natural rubber latex, containing a hydrophobically modified fructan, a starch hydrolysate derivative according to formula [B](-M)s, or mixtures thereof, wherein
- [B] represents a starch hydrolysate moiety with a dextrose equivalent (D.E.) value ranging from 2 to 47,
- (-M) represents a hydrophobic moiety, substituting at least one hydrogen atom of a hydroxyl group of [B], wherein (-M) is selected from the group consisting of:
- an alkylcarbamoyl radical of formula R1-NH—CO—,
- an alkenyl-carbamoyl radical of formula R2-NH—CO—,
- an alkylcarbonyl radical of formula R1-CO—,
- an alkenylcarbonyl radical of formula R2-CO—,
- an alkyl radical of formula R1-,
- an alkenyl radical of formula R2-, and
- a hydroxyalkyl radical of formula R3-,
- wherein:
- R1 represents a linear or branched alkyl group with 4 to 22 carbon atoms,
- R2 represents a linear or branched alkenyl group with 4 to 22 carbon atoms,
- R3 represents a linear or branched hydroxyalkyl group with 4 to 22 carbon atoms of formula —CHR′—CHOH—R″, wherein R′ is hydrogen or a linear or branched alkyl radical containing 2 to 20 carbon atoms;
- and R″ is a linear or branched alkyl radical containing 2 to 20 carbon atoms;
- and
- s represents the number of hydrophobic moieties (-M) attached to [B], expressed as the number average degree of substitution (av. DS) per individual fructosyl and/or glucosyl unit and ranging from 0.01 to 2.0.
A vulcanised natural rubber product, containing a hydrophobically modified fructan, a starch hydrolysate derivative according to formula [B](-M)s, or mixtures thereof, wherein
- [B] represents a starch hydrolysate moiety with a dextrose equivalent (D.E.) value ranging from 2 to 47,
- (-M) represents a hydrophobic moiety, substituting at least one hydrogen atom of a hydroxyl group of [B], wherein (-M) is selected from the group consisting of:
- an alkylcarbamoyl radical of formula R1-NH—CO—,
- an alkenyl-carbamoyl radical of formula R2-NH—CO—,
- an alkylcarbonyl radical of formula R1-CO—,
- an alkenylcarbonyl radical of formula R2-CO—,
- an alkyl radical of formula R1-,
- an alkenyl radical of formula R2-, and
- a hydroxyalkyl radical of formula R3-,
- wherein:
- R1 represents a linear or branched alkyl group with 4 to 22 carbon atoms,
- R2 represents a linear or branched alkenyl group with 4 to 22 carbon atoms,
- R3 represents a linear or branched hydroxyalkyl group with 4 to 22 carbon atoms of formula —CHR′—CHOH—R″, wherein R′ is hydrogen or a linear or branched alkyl radical containing 2 to 20 carbon atoms;
- and R″ is a linear or branched alkyl radical containing 2 to 20 carbon atoms;
- and
- s represents the number of hydrophobic moieties (-M) attached to [B], expressed as the number average degree of substitution (av. DS) per individual fructosyl and/or glucosyl unit and ranging from 0.01 to 2.0.
Dependencies are inferred from the claim text.