Patent Application
20080072791
DI water (183.86 g) and a 32.6%, 58 nm seed latex (23.02 g) were charged to a 1,000 mL reactor flask equipped with a mechanical stirrer, thermometer, temperature controlled, heating mantel, condenser and nitrogen sweep. The contents of the reactor flask were heated to 85° C.
In a separate container, BA (105.0 g), n-DDM (amount indicated in Table 1), DI water (94.29 g) and 28% SLS (10.71 g) were combined. The contents of this container were then emulsified in a high speed rotor stator mixer to form a monomer emulsion.
In another container, VI (45 g), VAZO® 68 free radical initiator (2.25 g), DI water (54.0 g), and 1N NaOH solution (17.76 g) were combined to form an aqueous feed solution.
The monomer emulsion and the aqueous feed solution were then fed separately to the reactor flask while maintaining the temperature of the reactor flask contents at 85° C. The feeds of the monomer emulsion and aqueous feed solution to the reactor flask were started simultaneously. The monomer emulsion fed then continued for 45 minutes while the aqueous feed solution feed continued for 90 minutes. Following the end of the aqueous feed solution feed, the contents of the reactor flask were held at 85° C. for an additional 2.5 hours for a total reaction time of 4 hours giving a product latex copolymer.
The solids content, as determined by gravimetry; the residual monomer content, as determined by GC; the particle size, as determined by light scattering particle size analysis; and the molecular weight, as determined by GPC, of the latex copolymers are reported in Table 1. The Tg of the dried copolymer, as determined by DSC, is also reported in Table 1.
DI water (253.4 g) and 28% SLS (10.72 g) were charged to a 1,000 mL round bottomed reactor flask equipped with a mechanical stirrer, thermometer, temperature controller, heating mantel, condenser and nitrogen sweep. The contents of the reactor flask were heated with agitation to 85° C.
In a separate container, BA (amount indicated in Table 2), VI (amount indicated in Table 2) and TMPTA (amount indicated in Table 2) were combined to form a monomer mix.
In another container, VAZO® 68 free radical initiator (1.50 g), DI water (73.5 g) and 1N NaOH (10.70 g) were combined to form an aqueous initiator solution.
The monomer mix and the aqueous initiator solution were then fed separately to the reactor flask while maintaining the temperature of the reactor flask contents at 85° C. The feeds of the monomer mix and aqueous initiator solution to the reactor flask were started simultaneously. The monomer mix feed then continued for 30 minutes while the aqueous initiator solution feed continued for 60 minutes. Following the end of the aqueous initiator solution feed, the contents of the reactor flask were held at 85° C. for an additional 2.0 hours for a total reaction time of 3.0 hours giving a product latex copolymer.
The solids content, as determined by gravimetry; the residual monomer content, as determined by GC; and the particle size, as determined by light scattering particle size analysis of the latex copolymer are reported in Table 2. The Tg of the dried copolymer, as determined by DSC, is also reported in Table 2.
DI water (255.42 g), 28% SLS (10.72 g) and a 32.6%, 58 nm seed latex (58.93 g) were charged to a 1,000 mL reactor flask equipped with a mechanical stirrer, thermometer, temperature controlled, heating mantel, condenser and nitrogen sweep. The contents of the reactor flask were heated to 85° C.
In a separate container, BA (amount indicated in Table 3), VI (amount indicated in Table 3) and TMPTA (amount indicated in Table 3) were combined to form a monomer mix.
In another container, VAZO® 68 free radical initiator (1.50 g), DI water (73.5 g) and 1N NaOH (11.77 g) were combined to form an aqueous initiator solution.
The monomer mix and the aqueous initiator solution were then fed separately to the reactor flask while maintaining the temperature of the reactor flask contents at 85° C. The feeds of the monomer mix and aqueous initiator solution to the reactor flask were started simultaneously. The monomer mix feed then continued for 30 minutes while the aqueous initiator solution feed continued for 60 minutes. Following the end of the aqueous initiator solution feed, the contents of the reactor flask were held at 85° C. for an additional 2.0 hours for a total reaction time of 3.0 hours giving a product latex copolymer.
The solids content, as determined by gravimetry; the residual monomer content, as determined by GC; and, the particle size, as determined by light scattering particle size analysis of the latex copolymer are reported in Table 3. The Tg of the dried copolymer, as determined by DSC, is also reported in Table 3.
DI water (379.63 g) and 28% SLS (16.07 g) were charged to a 1,000 mL round bottomed reactor flask equipped with a mechanical stirrer, thermometer, temperature controller, heating mantel, condenser and nitrogen sweep. The contents of the reactor flask were heated with agitation to 85° C.
In a separate container, EA (157.5 g), VI (67.5) and N,N-MBA (amount indicated in Table 4) were combined to form a monomer mix.
In another container, VAZO® 68 free radical initiator (2.25 g), DI water (110.25 g) and 1N NaOH (17.66 g) were combined to form an aqueous initiator solution.
The monomer mix and the aqueous initiator solution were then fed separately to the reactor flask while maintaining the temperature of the reactor flask contents at 85° C. The feeds of the monomer mix and aqueous initiator solution to the reactor flask were started simultaneously. The monomer mix feed then continued for 60 minutes while the aqueous initiator solution feed continued for 120 minutes. Following the end of the aqueous initiator solution feed, the contents of the reactor flask were held at 85° C. for an additional hour for a total reaction time of 3.0 hours giving a product latex copolymer.
The solids content, as determined by gravimetry; the residual monomer content, as determined by GC; and the particle size, as determined by light scattering particle size analysis of the latex copolymer are reported in Table 4.
Wood was treated with a 1000 ppm copper-containing preservative solution via vacuum-pressure treatment. Southern Yellow Pine wood cubes (conditioned to constant weight in a constant temperature and humidity room), measuring 19 mm, were placed in a pressure cylinder, and weighed down with a stainless steel screen and enough stainless steel nuts to prevent the cubes from floating in the aqueous treatment solution. Enough treatment solution was added to completely cover the cubes and the pressure in the cylinder was reduced to approximately 125 mm Hg (approximately 16.7 kPa) for 20 minutes. After this time, the cylinder was pressurized with nitrogen gas to 150 psig (1135 kPa absolute pressure). The pressure was maintained for 30 minutes, then released, the cubes removed, and reconditioned to constant weight in the same constant temperature and humidity room. The reconditioned cubes were then treated with an aqueous solution of the latex polymer via the same treatment process as noted above. Once the subsequently treated cubes had reconditioned to constant weight, they were used in the leaching assay. If the copper treated cubes were dip treated with the latex polymer, they were submerged in the latex polymer solution for 2 minutes, removed then resubmerged for 10 minutes before they were removed and reconditioned to constant weight. 0.1-1% Aqueous solutions of latex copolymers prepared in Examples 1, 2 and 5 were applied to the treated wood, either via a pressure treatment, or by dipping the wood into the solution, as indicated below. The AWPA E11-97 leaching assay was used to analyze leachate for copper content. The results are presented below in Tables 5 and 6.
This application claims the benefit of priority under 35 U.S.C. § 119(e) of U.S. Provisional Patent Application No. 60/846,653 filed on Sep. 22, 2006.
| Number | Date | Country | |
|---|---|---|---|
| 60846653 | Sep 2006 | US |
