polymer with releasable gas
A technology of polymers and compositions, applied in the direction of cation exchange materials, etc., can solve the problems of long time and difficulty that cannot be completed
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0116] Preparation of the reaction mixture
[0117] Suspensions of droplets suspended in an aqueous medium were prepared using the spraying procedure described in US 4,444,960 and US 4,623,706. The droplets contain styrene, DVB and BPO. The aqueous medium contains deionized water, CMMC, PVOH and sodium nitrite. The composition of the composition intended for droplets is as follows:
[0118] Droplet Composition:
[0119] Element
quantity (1)
Styrene balance (2)
DVB 5.2％ BPO 0.5％
[0120] Note (1): % by weight, based on the total weight of the droplet components.
[0121] Note (2): To constitute 100% by weight
[0122] The composition intended for the aqueous liquid medium is as follows:
[0123] water phase composition
[0124]
[0125]
[0126] Note (3): % by weight, based on the total weight of the aqueous phase ingredients
[0127] During the preparation of the reaction mixture, some individual ingredients or por...
example 1
[0129] Example 1: Addition of NaOH at 53% reaction degree
[0130] Preparation of Example 1.
[0131] The reaction mixture was subjected to aqueous suspension polymerization as follows. The reaction mixture was heated to 80°C, and the extent of the reaction was monitored. At some point, a portion of the NaOH solution was added to the reaction mixture. The amount of NaOH added is characterized by the weight of ppm of NaOH based on the weight of water. Prepared as follows
[0132]
[0133] At the beginning of the polymerization, the pH was 6.5. At the completion of the polymerization, the pH was 10.8. The product was polymer beads with a harmonic mean size of 210 μm.
[0134] The results of Example 1 are as follows:
[0135]
[0136] Note (4): Addition of NaOH solution
[0137] All measurements made after the 90% degree showed a rate of 20% / hr or less. Before NaOH addition at the level of 53%, the rate leveled off at ~30% / hr; after NaOH addition, the rate increased ...
example 2
[0143] Example 2: Addition of NaOH at levels from 32.5% to 51%, and pH measurements
[0144] Three additional polymerizations (Example 2-1, Example 2-2, and Example 2-3) were performed using the same materials and methods as Example 1. In Example 2, the degree of NaOH addition varied, and the overall batch size in Example 2 was smaller than in Example 1. In Example 2, the pH was measured immediately after the addition of NaOH. The result is as follows:
[0145] Example 2
[0146] 2-1 2-2 2-3 initial pH 6.4 6.5 6.5 The extent of the first NaOH addition 42％ 51％ 32.5％ ppm of NaOH added for the first time 210 210 210 pH immediately after the first NaOH addition 11.26 11.27 11.58 The extent of the second NaOH addition 87.5％ 86.0％ 87.5％ The pH just before the second NaOH addition 7.31 7.75 7.24 ppm of the second NaOH addition 100 100 100 pH immediately after the second NaOH addition 11.0 10.78 10.89 ...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More