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US 9,422,451 B2Granted
Low density fuel resistant sulfur-containing polymer compositions and uses thereof
AssigneePRC-DeSoto International, Inc.
InventorsChandra Rao, Marfi Ito, Renhe Lin
Life of this patent
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Abstract
Low-density compositions and sealants prepared from sulfur-containing prepolymer compositions that exhibit enhanced fuel resistance are disclosed. The low density and enhanced fuel resistance is realized by using polyphenylene sulfide fillers.
Claims18
A composition, comprising:
- from 45 wt % to 70 wt % of a sulfur-containing prepolymer, wherein the sulfur-containing prepolymer comprises:
- a thiol-terminated polythioether comprising a backbone comprising the structure of Formula (1):
- —R1-[—S—(CH2)2—O-(—R2—O—)m—(CH2)2—S—R1]n— (1)
- wherein,
- each R1 is independently selected from C2-10 n-alkanediyl, C3-6 branched alkanediyl, C6-8 cycloalkanediyl, C6-10 alkanecycloalkanediyl, heterocyclic, -[(—CHR3—)p—X—]q—(CHR3)r—, wherein each R3 is selected from hydrogen and methyl;
- each R2 is independently selected from C2-10 n-alkanediyl, C3-6 branched alkanediyl, C6-8 cycloalkanediyl, C6-14 alkanecycloalkanediyl, heterocyclic, and -[(—CH2—)p—X—]q—(CH2)r—;
- each X is independently selected from O, S, and —NR—, wherein R is selected from hydrogen and methyl;
- m is an integer from 0 to 50;
- n is an integer ranging from 1 to 60;
- p is an integer ranging from 2 to 6;
- q is an integer ranging from 1 to 5;
- and
- r is an integer ranging from 2 to 10;
- a thiol-terminated polysulfide having a weight average molecular weight from 1,100 Daltons to 8,000 Daltons;
- or
- a combination thereof;
- and
- from 5 wt % to 40 wt % thermoplastic polyphenylene sulfide resin particles,
- wherein wt % is based on the total weight of the composition.
16 more elements
A composition, comprising:
- (a) from 45 wt % to 70 wt % of a thiol-terminated sulfur-containing prepolymer, wherein the thiol-terminated sulfur-containing prepolymer comprises:
- (i) a thiol-terminated polythioether comprising a backbone comprising the structure of Formula (1):
- —R1-[—S—(CH2)2—O-(—R2—O—)m—(CH2)2—S—R1]n— (1)
- wherein,
- each R1 is independently selected from C2-10 n-alkanediyl, C3-6 branched alkanediyl, C6-8 cycloalkanediyl, C6-10 alkanecycloalkanediyl, heterocyclic, -[(—CHR3—)p—X—]q—(CHR3)r—, wherein each R3 is selected from hydrogen and methyl;
- each R2 is independently selected from C2-10 n-alkanediyl, C3-6 branched alkanediyl, C6-8 cycloalkanediyl, C6-10 alkanecycloalkanediyl, heterocyclic, and -[(—CH2—)p—X—]q—(CH2)r—;
- each X is independently selected from O, S, and —NR—, wherein R is selected from hydrogen and methyl;
- m is an integer from 0 to 50;
- n is an integer ranging from 1 to 60;
- p is an integer ranging from 2 to 6;
- q is an integer ranging from 1 to 5;
- and
- r is an integer ranging from 2 to 10;
- (ii) a thiol-terminated polysulfide having a weight average molecular weight from 1,100 Daltons to 8,000 Daltons;
- or
- (iii) a combination thereof;
- and
- (b) from 5 wt % to 40 wt % of thermoplastic polyphenylene sulfide resin particles;
- (c) from 1 wt % to 10 wt % of an inorganic filler;
- and
- (d) a polyepoxy curing agent comprising a novolac epoxy resin, a bisphenol A/epichlorohydrin derived epoxy resin, or a combination thereof
- wherein wt % is based on the total weight of the composition.
19 more elements
Dependencies are inferred from the claim text.