Poly(3-hydroxyacid) polymers from long-chain epoxides and their uses related to hot melt adhesives
A macromolecule comprises a ring-opened polymerized product of β-lactone monomers of formula I: and having a structure of formula IA: wherein R 1 is an alkyl group having at least 8 carbon atoms. The macromolecule may be hydroxy-terminated, and may be copolymerized with other β-lactone monomers having different substituting groups and/or with higher lactone monomers. The macromolecule may be used as a reactant to form an alkoxysilane-terminated polymer, a polyurethane, or a (co)polyester, or may be used as an elastomeric midblock in a triblock copolymer having hard end blocks, such as polylactic acid. Such triblock systems demonstrate two discreet regions having properties similar to styrene block copolymers and are therefore suitable for use as hot melt or pressure-sensitive adhesives. In some embodiments, such triblock polymers may be entirely bio-sourced and compostable.
1. A macromolecule comprising a ring-opened polymerized product of β-lactone monomers of formula I:
and higher lactone monomers of formula III:
wherein X=(CH 2 ) a , or
and having a structure of formula IIIB:
wherein: (1) R 2 is hydrogen or an alkyl or a substituted alkyl; (2) a is at least 3; (3) the total of m and p is between 10 and 10,000; (4) the macromolecule is a diol and is hydroxy-terminated and R 1 is an alkyl having at least 8 carbon atoms; and (5) D is a hydrocarbon residue from a diol initiator.
2. The macromolecule of claim 1 , wherein the diol initiator comprises 1,4-benzenedimethanol.
3. The macromolecule of claim 1 , wherein the diol initiator comprises a polymer.
4. A method for making a silane-modified, moisture curable oligomer or polymer comprising reacting the macromolecule claim 1 with a siloxide to form an alkoxysilane-terminated oligomer or polymer.
5. A method for making a polyurethane comprising reacting the macromolecule of claim 1 with an isocyanate.
6. A method for making a (co)polyester comprising reacting the macromolecule of claim 1 with a diacid or diester.
7. A triblock copolymer having an A:B:A backbone, wherein block B comprises a residue of the macromolecule of claim 1 and block A is a residue of a polymer selected from the group consisting of polylactic acid, polycaprolactone, polyhydroxybutyrates, or polyamides or copolymers thereof.
8. The triblock copolymer of claim 7 , wherein block A is amorphous and has a melting temperature (T m ) of above 60° C.
9. The triblock copolymer of claim 7 , wherein block A is immiscible with block B.
10. The triblock copolymer of claim 7 , wherein the triblock copolymer comprises 95 to 40 molar percent of the block B and 60 to 5 molar percent of the block A.
11. The triblock copolymer of claim 7 , wherein block A is a ring-opened polymerized product of lactide.
12. A hot melt adhesive comprising the triblock copolymer of claim 7 .
13. The hot melt adhesive of claim 12 further comprising a tackifier, a plasticizer, and, optionally, other additives.
14. A pressure sensitive adhesive comprising the triblock copolymer of claim 7 .
15. The pressure sensitive adhesive of claim 14 further comprising a tackifier, a plasticizer, and, optionally, other additives.
16. The macromolecule of claim 1 , wherein the β-lactone monomers of formula I are non-functionalized.
17. The macromolecule of claim 1 , wherein the β-lactone monomers of formula I are produced by carbonylation of an epoxide.
18. The macromolecule of claim 3 , wherein the polymer is selected from the groups consisting of polyethylene glycol and polypropylene glycol.