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US 12,528,971 B2Granted
Coating composition containing TMCD polyester and a modifying polyester
AssigneeEastman Chemical Company
InventorsLinqian Feng, Cameron Lee Brown, John Thorton Maddox, Alain Michel Cagnard, Selene Ayde De Leon Ibarra, Thauming Kuo
Life of this patent
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Abstract
This invention pertains to coating compositions based on polyesters containing 2,2,4,4-tetrametbyM,3-cyclobutanediol (TMCD) and modifying polyester polyols. Coatings based on such polyester blends are capable of providing a good balance of the desirable coating properties, such as solvent resistance, acid resistance, retort resistance, crazing resistance, and bending ability, for metal packaging applications.
Claims19
A coating composition for metal packaging application, comprising:
- a. a 2,2,4,4-Tetramethyl-1,3-cyclobutanediol (TMCD) polyester, which is the reaction product of the monomers comprising:
- i. TMCD in an amount of 35-80 mole %, based on the total moles of (a)(i-iv),
- ii. 1,4-cyclohexanedimethanol (1,4-CHDM) in an amount of 20-65 mole %, based on the total moles of (a)(i-iv),
- iii. a diol other than TMCD and other than 1,4-CHDM in an amount of 0-25 mole %, based on the total moles of (a)(i-iv),
- iv. trimethylolpropane (TMP) in an amount of 0-5 mole %, based on the total moles of (a)(i-iv),
- v. an aromatic diacid in an amount of 90-100 mole %, based on the total moles of (a)(v-vi), and
- vi. an aliphatic diacid in an amount of 0-10 mole %, based on the total moles of (a)(v-vi),
- b. a modifying polyester which is the reaction product of the monomers comprising:
- i. a cyclic diol in an amount of 30-55 mole %, based on the total moles of (b)(i-iii),
- ii. 2-methyl-1,3-propanediol (MPdiol) in an amount of 30-67 mole %, based on the total moles of (b)(i-iii),
- iii. trimethylolpropane (TMP) in an amount of 3-20 mole %, based on the total moles of (b)(i-iii),
- iv. terephthalic acid (TPA) or isophthalic acid (IPA) or a mixture thereof in an amount of 55-85 mole %, based on the total moles of (b)(iv-v), and
- v. an aliphatic diacid in an amount of 15-45 mole %, based on the total moles of (b)(iv-v), and
- c. one or more crosslinkers selected from the group consisting of resole phenolic resin, isocyanate, and amino resin crosslinkers,
- wherein said TMCD polyester has a glass transition temperature (Tg) of 60-110° C., acid number of 0-8 mg KOH/g), hydroxyl number of 3-25 mgKOH/g, number average molecular weight of 5,000-20,000 g/mole, and weight average molecular weight of 10,000-100,000 g/mole;
- said modifying polyester has a Tg of 20-50° C., acid number of 0-10 mg KOH/g, hydroxyl number of 30-60 mgKOH/g, Mn of 2,000-10,000 g/mole, and Mw of 10,000-150,000 g/mole;
- and wherein said coating has a solvent resistance of greater than 70 MEK double rubs as measured by ASTM D7835, a wedge bend resistance (% pass) of 60-100 as measured by the method of ASTM D3281.
14 more elements
A coating composition for gold-color coating having improved coating properties for metal packaging application, which comprises:
- a. a 2,2,4,4-Tetramethyl-1,3-cyclobutanediol (TMCD) polyester in an amount of 30-40 weight % based on the total weight of (a), (b), (c), and (d), which is the reaction product of the monomers comprising:
- i. TMCD in an amount of 35-80 mole %, based on the total moles of (a)(i-iv),
- ii. 1,4-cyclohexanedimethanol (1,4-CHDM) in an amount of 20-65 mole %, based on the total moles of (a)(i-iv),
- iii. a diol other than TMCD and other than 1,4-CHDM in an amount of 0-25 mole %, based on the total moles of (a)(i-iv),
- iv. trimethylolpropane (TMP) in an amount of 0-5 mole %, based on the total moles of (a)(i-iv),
- v. an aromatic diacid in an amount of 90-100 mole %, based on the total moles of (a)(v-vi), and
- vi. an aliphatic diacid in an amount of 0-10 mole %, based on the total moles of (a)(v-vi),
- b. a modifying polyester in an amount of 30-40 weight % based on the total weight of (a), (b), (c), and (d), which is the reaction product of the monomers comprising:
- i. a cyclic diol in an amount of 30-55 mole %, based on the total moles of (b)(i-iii),
- ii. 2-methyl-1,3-propanediol (MPdiol) in an amount of 30-67 mole %, based on the total moles of (b)(i-iii),
- iii. trimethylolpropane (TMP) in an amount of 3-20 mole %, based on the total moles of (b)(i-iii),
- iv. terephthalic acid (TPA) or isophthalic acid (IPA) or a mixture thereof in an amount of 55-85 mole %, based on the total moles of (b)(iv-v), and
- v. an aliphatic diacid in an amount of 15-45 mole %, based on the total moles of (b)(iv-v),
- c. a resole phenolic resin in an amount of 15-30 weight % based on the total weight of (a), (b), and (c), and
- d. isophorone diisocyanate (IPDI) in an amount of 5-15 weight % based on the total weight of (a), (b), and (c),
- wherein said TMCD polyester has a glass transition temperature (Tg) of 60-110° C., acid number of 0-8 mg KOH/g), hydroxyl number of 3-25 mgKOH/g, number average molecular weight (Mn) of 5,000-20,000 g/mole, and weight average molecular weight (Mw) of 10,000-100,000 g/mole;
- said modifying polyester has a Tg of 20-50° C., acid number of 0-10 mg KOH/g, hydroxyl number of 30-60 mgKOH/g, Mn of 2,000-10,000 g/mole, and Mw of 10,000-150,000 g/mole;
- and wherein said coating has a solvent resistance of greater than 70 MEK double rubs as measured by ASTM D7835, a wedge bend resistance (% pass) of 60-100 as measured by the method of ASTM D3281.
15 more elements
Dependencies are inferred from the claim text.