Polyisophthalate and copolymers thereof having reduced cyclic dimer content, and a process for making the same
US4424337A · kind A · utility
31Cited by
3References
25Claims
0Family size
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Key dates
| Filing date | Sep 7, 1982 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | Sep 7, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/82
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyisophthalate such as poly(ethylene isophthalate) and copolymers thereof having high intrinsic viscosities as well as reduced ring dimer of ethylene isophthalate, and a process for making the same. A protonic acid catalyst is utilized along with intrinsic viscosity modifying agents during preparation of the polyisophthalate. The polymers produced have very high clarity, improved oxygen and carbon dioxide barrier resistance, high glass transition temperature, as well as increased molecular weights. They are thus suitable for use as materials in packaging or forming containers, such as bottles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.