IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0500145
(2009-07-09)
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등록번호 |
US-8143370
(2012-03-27)
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발명자
/ 주소 |
|
출원인 / 주소 |
- PRC-DeSoto International, Inc.
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
4 |
초록
▼
One-part moisture curable sealant compositions and methods of making the same are provided. The composition includes a silane-terminated polythioether component and a catalyst. The silane-terminated polythioether component and catalyst are isolated from moisture to prevent curing. The composition is
One-part moisture curable sealant compositions and methods of making the same are provided. The composition includes a silane-terminated polythioether component and a catalyst. The silane-terminated polythioether component and catalyst are isolated from moisture to prevent curing. The composition is stable against curing at ambient temperature and under conditions substantially free of moisture. When the composition is applied to a substrate and exposed to moisture, the composition cures to form a sealant. A method of making a sealant composition includes reacting a mercapto-terminated polythioether with a compound having a silane group to form a silane-terminated polythioether. The silane-terminated polythioether is then combined with a catalyst and isolated from moisture to prevent curing. Lastly, the composition is applied to a substrate and exposed to moisture which allows the composition to cure to form a sealant.
대표청구항
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1. A composition for forming a sealant, the composition comprising: a silane-terminated polythioether component represented by (YaAb)SiR4Z′—R′—Z′R4Si(YaAb) wherein: R′ is a polythioether chain having at least one —C—S—C— linkage in its backbone and wherein the backbone is free of S—S linkages and es
1. A composition for forming a sealant, the composition comprising: a silane-terminated polythioether component represented by (YaAb)SiR4Z′—R′—Z′R4Si(YaAb) wherein: R′ is a polythioether chain having at least one —C—S—C— linkage in its backbone and wherein the backbone is free of S—S linkages and essentially free of ester linkages,Y is a hydrolyzable and condensable functional group,A is selected from the group consisting of C1 to C4 hydrocarbon functional groups,Z′ is R4 is a C1 to C3 hydrocarbon chain; R5 is hydrogen or a hydrocarbon chain; anda and b are each an integer ranging from 0 to 3, and the sum of a and b is 3;a catalyst; anda filler. 2. The composition of claim 1, wherein the silane-terminated polythioether component comprises a reaction product of a compound having a silane group and a mercapto-terminated polythioether. 3. The composition of claim 2, wherein the compound having a silane group is selected from the group consisting of silane-terminated vinyl compounds, silane-terminated isocyanate compounds, and silane-terminated epoxy compounds. 4. The composition of claim 1, wherein the catalyst comprises a tin catalyst. 5. The composition of claim 1, wherein the composition is substantially free of any polyolefin, polyacrylate, metal oxide, and polyepoxide curing agent. 6. A sealant formed from the composition of claim 1. 7. An aerospace vehicle comprising an aperture at least partially sealed with the sealant of claim 6. 8. A composition comprising a compound represented by Formula 2: (YaAb)SiR4Z′—[—S—R1—S—(CH2)p—O—(—R2—O—)m—(CH2)q]n—S—R1—S—Z′R4Si(YaAb) (2)wherein: R1 is selected from the group consisting of C2 to C10 n-alkylene groups, C2 to C6 branched alkylene groups, C6 to C8 cycloalkylene groups, C6 to C10 alkylcyloalkylene groups, heterocyclic groups, —[(—CH2)p—X]q—(CH2)r— groups, and —[(—CH2)p—X]q—(—CH2)r— groups in which at least one —CH2— unit is substituted with a methyl group;R2 is selected from the group consisting of C2 to C10 n-alkylene groups, C2 to C6 branched alkylene groups, C6 to C8 cycloalkylene groups, C6 to C14 alkylcyloalkylene groups, heterocyclic groups, and —[(—CH2)p—X]q—(CH2)r— groups;Y is a hydrolyzable and condensable functional group;A is selected from the group consisting of C1 to C4 hydrocarbon functional groups;X is selected from the group consisting of O atoms, S atoms, and —NR3— groups, wherein R3 is selected from the group consisting of H atoms and methyl groups;Z′ is a functional group resulting from a reaction between mercaptan and a functional group selected from the group consisting of isocyanate groups, epoxy groups and vinyl groups;R4 is a C1 to C3 hydrocarbon chain;m is an integer ranging from 1 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;r is an integer ranging from 2 to 10; anda and b are each an integer ranging from 0 to 3, and the sum of a and b is 3;a catalyst; anda filler. 9. The composition of claim 8, wherein the compound represented by Formula 2 is 10. The composition of claim 8, wherein m is 1, R2 is n-butylene, and R1 is not ethylene or n-propylene. 11. The composition of claim 8, wherein m is 1, p is 2, q is 2, r is 2, R2 is ethylene, and X is not an O atom. 12. The composition of claim 8, wherein Y is an alkoxy group. 13. The composition of claim 12, wherein Y is a methoxy or ethoxy group. 14. A method of preparing a sealant, the method comprising: reacting a mercapto-terminated polythioether with a compound having a silane group to form a silane-terminated polythioether represented by (YaAb)SiR4Z′—R′—Z′R4Si(YaAb) wherein: R′ is a polythioether chain having at least one —C—S—C— linkage in its backbone and wherein the backbone is free of S—S linkages and ester linkages,Y is a hydrolyzable and condensable functional group,A is selected from the group consisting of C1 to C4 hydrocarbon functional groups,Z′ is R4 is a C1 to C3 hydrocarbon chain, R5 is hydrogen or a hydrocarbon chain, anda and b are each an integer ranging from 0 to 3, and the sum of a and b is 3;combining the silane-terminated polythioether with a catalyst to form a composition; andisolating the composition from moisture, wherein the composition remains uncured at ambient temperature when isolated from moisture.
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