Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-07-10
1998-12-15
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 66, 525 71, 525193, C08L 6702, C08L 7700, C08L 5106
Patent
active
058498443
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the preparation of a plastics blend which contains a polyolefin--condensation polymer blend, by which process a plastics blend having good thermomechanical pries is obtained and-by which process the property profile of the plastics blend can be adjusted in a controlled manner. The invention also relates to the use of a plastics blend which contains a polyolefin--condensation polymer blend, produced by this process, in applications requiring different types of processing methods, either as such or, for example as part of a multiple-layer product.
The use of plastics blends in the plastics industry is very common and varied. Plastics blends are used mainly for two different reasons, namely, the use of blends is to a high degree dependent on cost factors, i.e. polymers having the desired properties but being expensive may be mixed at suitable proportions with more economical polymers. A second factor is that by a suitable combining of different polymers the good properties of each component are obtained in the product being manufactured. Plastics blends may, of course, contain in addition to polymers also fillers such as talcum, fiber reinforcements, etc. Furthermore, plastics blends may contain numerous additives of different types, such as stabilizers, pigments, mold lubricants, foaming agents, fire retardants, etc. The most common methods of preparing plastics blends are so-called melt-mixing methods or dry-mixing methods. By melt-mixing methods the different components can be combined, for example, in an extruder within a suitable temperature range. Plastics blends can be used, for example, in injection molding, fiber, film, thermoforming, extrusion, extrusion coating, lamination, and blow molding applications.
Polyolefin--condensation polymer blends of various types are known in rather large numbers in the plastics industry. Condensation polymerization is typically used for prepaing, for example, polyesters or polyamides. Blends of polyolefins and polyesters or polyamides are also known in the patent literature.
EP patent publication 364 304 discloses a polyolefin-polyester blend which comprises 10-90% by weight a polyester in which the IV (intrinsic viscosity) is 0.30-1.20 and the quantity of carboxyl end groups is 15-200 milliequivalents/kg, and 90-10% by weight a modified polyolefin having 0.2-5 mol. % epoxy or carboxylic groups and having a low mean molar mass, i.e. 8000-14000. The blend is prepared first by dry mixing the components and then by melt mixing them in, for example, a twin screw extruder at. approx. 260.degree. C.-320.degree. C. The formed modified polyolefin-polyester graft copolymer is used as a compatibilizer between polycarbonates and polyolefins.
According to EP patent publication 443 736, the polyolefin-polyester blend described above and prepared in a corresponding manner is, in turn, used as a compatibilizer between polyolefins and polyesters.
EP patent publication 336 320 discloses a complicated polymer blend which is made up of a carboxylic-acid(anhydride)-modified polypropylene, a saturated polyester, a copolymer containing epoxy groups, a modified or non-modified ethylene copolymer rubber, and an alkaline, preferably amine-type, material.
Several plastics applications in which polyolefin-polyester/amide blends can be used require that the plastic has good strength properties, such as a good impact strength or elasticity modulus. However, there is usually the problem that, when one of the said properties is made sufficiently good, for example by means of a suitable mixing ratio or an elastomer addition, the other one is respectively deteriorated. Furthermore, the achieving of the desired properties has usually required higher contents of elastomeric polymer, which in turn results in a situation in which the property profile of the blend is no longer controllable. Furthermore, problems may arise in the capacity of a plastics product containing such a polymer blend to be colored and painted.
An object of the present invention has been to fi
REFERENCES:
patent: 5312867 (1994-05-01), Mitsurna
patent: 5391607 (1995-02-01), Fujii
Aarila Jari
Koski Elina
Borealis A/S
Short Patricia A.
LandOfFree
Polyolefin-condensation polymer blend does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyolefin-condensation polymer blend, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyolefin-condensation polymer blend will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1458912