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1. A hot melt desiccant matrix composition comprising as components thereof a mixture of the following ingredients:a. an organic binder component A, said Component A comprises:i. About 10% to 80% by weight of a poly-.alpha.-olefin polymer having a melting point or a glass transition temperature less than 180.degree. C., a density in the range of 0.85 to 0.95 g/cc or a blend of poly-.alpha.-olefin polymers; the said polyolefin polymer is selected from the group consisting of any polymerization products of propylene or propylene with at least one .alpha.-olefin having C2 to C18 carbon length;ii. About 5% to 70% by weight of a plasticizer having a flash point equal to or greater than 180.degree. C.;iii. About 0% to 50% by weight a compatible tackifier; andiv. A stabilizer in the amount of about 0% to 5% by weight.b. an absorbent component B, said component B comprised of a water/moisture absorbing material, or a VOC absorbing material, or a blend of water/moisture absorbing material and a VOC absorbing material, and wherein said absorbing material is selected from the group of absorbing materials including, but not limited to, silica gels, activated carbons, silica alumina, calcium sulfate, calcium oxide, natural zeolites and molecular sieves and mixtures thereof, wherein the ratio of organic binder component A to absorbent component B ranges from about 30% by weight to about 80% by weight of A, and the total amount of A and B adding up to 100% by weight.
2. The composition of claim 1 where said polyolefin in Component A is a homopolymer of propylene or copolymer of propylene and ethylene having less than 30% by weight of ethylene.
3. The composition of claim 2 where said homo or copolymer of propylene and ethylene is produced by using single-site catalyst (SSC) technology.
4. The composition of claim 2 where the said homo or copolymer of propylene has a density between 0.85 and 0.89 g/cc at 20.degree. C. and a melt flow rate between 5 to 200 g/10 min at 230.degree. C.
5. The composition of claim 1 where the said polyolefin is an amorphous poly-.alpha.-olefin (APAO) having a melt viscosity of at least 1000 cP at 190 C and a density of 0.85 to 0.90 g/cc at 20.degree. C.
6. The composition of claim 5 where the said APAO is a homopolymer of propylene.
7. The composition of claim 5 where the said APAO is a copolymer of ethylene and propylene.
8. The composition of claim 5 where the said APAO is a copolymer of propylene and butane-1.
9. The composition of claim 1 where said polymer blend of Component A comprises a poly-.alpha.-olefin and an EPR or EPDM rubber.
10. The composition of claim 1 where said composition further comprises a colorant in the amount of 0.1 to 5% by weight.
11. The composition of claim 10 where said colorant comprises carbon black or a mixture of titanium dioxide and carbon black.
12. The composition of claim 1 where the binder Component A contains 1-20% by weight of a wax.
13. The composition of claim 12 where said wax is selected from the group comprising paraffin, microcrystalline, polyethylene and polypropylene waxes.
14. The composition of claim 1 where the said plasticizer is a mineral oil.
15. The composition of claim 1 where the said compatible tackifier comprises C5, hydrogenated C5, C9 modified C5 (C5/C9), hydrogenated C5/C9, hydrogenated C9, hydrogenated DCPD and polyterpene resins
16. The composition of claim 1 where the absorbent Component B comprises an activated molecular sieve or a mixture of molecular sieves.
17. The composition of claim 16 where said molecular sieve is an activated molecular sieve 3A powder having an average particle size between 0.1 and 25 microns in diameter.
18. The composition of claim 16 where said molecular sieve is a mixture of activated molecular sieve 3A and 10A powders.
19. The composition of claim 18 where the ratios of molecular sieve 10A range from 5% to 20% by weight.
20. The composition of claim 16 where said molecular sieve is a mixture of activated molecular sieve 3A and 13X powders.
21. The composition of claim 17 where the ratios of molecular sieve 13X range from 5 to 20% by weight.
22. The composition of claim 1 where the said polyolefin comprises an EPR or EPDM rubber.
23. An insulating glass unit having the composition of claim 1 disposed inside a spacer channel.
24. The insulating glass unit of claim 20 where the said spacer is an intercept spacer produced on a GED line. |
