Polyester compositions
A polyester including at least one crosslinkable moiety is described. Each crosslinkable moiety includes at least one crosslinkable pendent group. A ratio of a total number of the at least one crosslinkable pendent groups to a total number of ester groups in the polyester may be in a range of 0.0001 to 0.5.
1. A polyester comprising at least one crosslinkable moiety, each crosslinkable moiety including at least one crosslinkable pendent group, wherein a ratio of a total number of the at least one crosslinkable pendent groups to a total number of ester groups in the polyester is in a range of 0.0001 to 0.5, wherein the polyester has a glass transition temperature less than 0° C.
2. The polyester of claim 1 , wherein the ratio of the total number of the at least one crosslinkable pendent groups to the total number of ester groups in the polyester is in a range of 0.001 to 0.1.
3. A polyester comprising at least one crosslinkable moiety, each crosslinkable moiety including at least one crosslinkable pendent group, wherein a ratio of a total number of the at least one crosslinkable moiety to a total number of ester groups in the polyester is in a range of 0.0001 to 0.5, wherein the polyester has a glass transition temperature less than 0° C.
4. The polyester of claim 3 , wherein the ratio of the total number of the at least one crosslinkable moiety to the total number of ester groups in the polyester is in a range of 0.001 to 0.1.
5. A polyester comprising the reaction product of reactive precursors, the reactive precursors comprising:
at least one diacid or diester;
at least one diol not containing a crosslinkable pendent group; and
at least one monomer containing at least one crosslinkable pendent group;
wherein a ratio of the number of molecules of the at least one monomer to a sum of the number of molecules of the at least one diacid or diester and the number of molecules of the at least one diol is in a range of 0.0001 to 0.5,
wherein the polyester has a glass transition temperature less than 0° C.
6. The polyester of claim 5 , wherein the ratio of the number of molecules of the at least one monomer to the sum of the number of molecules of the at least one diacid or diester and the number of molecules of the at least one diol is in a range of 0.001 to 0.1.
7. The polyester of claim 5 , wherein a ratio of the number of molecules of the at least one diacid or diester to the number of molecules of the at least one diol is in a range of 0.85 to 1.15.
8. The polyester of claim 5 , wherein a ratio of the number of molecules of the at least one diacid or diester to the number of molecules of the at least one diol is in a range of 0.9 and 1.1.
9. The polyester of claim 1 , wherein the at least one crosslinkable pendent group comprises a carbon-carbon double bond.
10. The polyester of claim 1 , wherein the at least one crosslinkable moiety includes a moiety arising from a reacted diol monomer, a moiety arising from a reacted diacid monomer, a moiety arising from a reacted diester moiety, or a combination thereof.
11. The polyester of claim 5 , wherein the at least one monomer containing the crosslinkable pendent group comprises a diol monomer, a diacid monomer, a diester monomer or a combination thereof.
12. The polyester of claim 1 , wherein each moiety has the formula:
wherein R1 is —O—, —(CH2)n-, —COO—, —OCO—, —OOC—, —S—, or —(C═O)—;
R2 is —OH, —COOH, or R2′-, wherein R2′- is —O—, —COO—, —(CH2)n-, —(C═O)—, or —S—;
R3 is —H, —CH3, —OH, —CH2OH, —(CH2)m-CH3, —SO3Na, or —COONa;
R4 is —O—, —COO—, —(CH2)p-, —(C═O)—, or —S—;
and n, m and p are positive integers.
13. The polyester of claim 12 , wherein n, m and p are independently in a range of 1 to 100.
14. The polyester of claim 12 , wherein the moiety has the formula:
15. An adhesive composition comprising the polyester of claim 1 and further comprising a tackifier.
16. An adhesive comprising a cured polyester, the cured polyester comprising the polyester of claim 1 cured by the application of radiation or heat, the adhesive being a pressure sensitive adhesive.
17. The polyester of claim 1 having a crystallinity corresponding to a differential scanning calorimetry melting endotherm of less than 20 J/g.
18. An adhesive comprising a cured polyester and a tackifier, the cured polyester comprising the polyester of claim 3 cured by the application of radiation or heat, the adhesive being a pressure sensitive adhesive.
19. An adhesive comprising a cured polyester and a tackifier, the cured polyester comprising the polyester of claim 5 cured by the application of radiation or heat, the adhesive being a pressure sensitive adhesive.
20. The polyester of claim 5 , wherein the at least one diacid or diester comprises sebacic acid.