Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-04-18
1998-12-22
Morgan, Kriellion S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524127, 524140, 524141, 523220, 523223, C08K 534, C08K 552
Patent
active
058520821
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a flame retardant resin composition which emits no hazardous gases upon burning, produces only a small amount of ash, and excels in mechanical strength.
Conventional polyolefin-based flame retardant resin compositions known in the art contain: 1) magnesium hydroxide or aluminum hydroxide and utilize an endothermic reaction, whereby water of crystallization is released from magnesium hydroxide or aluminum hydroxide at 200.degree.-350.degree.C.; or 2) the combination of antimony trioxide and halogen compounds and utilize the so-called "free radical trapping effect" of antimony halides produced upon burning, and the dehydration-carbonation of antimony oxyhalides.
In order to obtain excellent flame resistance, these conventional polyolefin-based flame retardant resin compositions require magnesium hydroxide or aluminum hydroxide to be added in an amount equal to or greater than the amount of the polyolefin-based resin. The high content of aluminum hydroxide and/or magnesium hydroxide tends to decrease mechanical strength or processability and creates an excessive amount of ash when burnt during incineration after use, which increases costs for ash disposal. On the other hand, although the combination which has an effect by adding a small amount of antimony trioxide and halogen compounds has long been used, the problem of emitting hazardous gases upon burning has not been solved.
In view of environmental protection, demand has increased for a flame retardant resin composition which uses a non-halogen-based flame retardant and produces little ash upon incineration after use. A method was disclosed for imparting flame resistance by adding melamine cyanurate to the polyolefin-based resin in Japanese Patent Publication No. 59-50184. However, since melamine cyanurate alone has hydrophilic particle surfaces, affinity with and thus dispersion into the resin is poor when melamine cyanurate is added to the polyolefin-based resin, which decreases the mechanical strength of the resin and inhibits flame retarding properties.
In order to improve affinity with polyolefin-based resins, a method for imparting flame resistance to the polyolefin-based resins without decreasing mechanical strength was proposed in which melamine cyanurate is surface-treated with a nonionic surfactant having an HLB of 1 to 8 and is used in combination with a phosphorus compound (Japanese Patent Application Laid-Open No. 6-157820). This method of surface treatment using a surfactant was effective for improving the affinity of melamine cyanurate with resins. However, due to a relatively low molecular-weight, the surfactant presented on the surface of the melamine cyanurate easily migrates and diffuses through the resins in which it is dispersed. This results in poor appearance of the product. The amount of surfactant was decreased in order to minimize migration to the surface of the resins but affinity with the resins was lowered and the improvement of mechanical strength and flame resistance of the resins was also limited.
It is the object of the present invention to solve problems in the prior art and provide a flame retardant resin composition which emits no hazardous gases when burnt, produces only a small amount of ash and exhibits excellent mechanical strength.
Although melamine cyanurate has high flame resistance, it could not be compounded in an amount necessary for achieving sufficient flame resistance because the affinity of melamine cyanurate with polyolefin-based resins and dispersion into the resin is poor and the mechanical strength of the resins is decreased. The inventors of the present invention examined these problems and found that the mechanical strength of the resins decreased as the amount of melamine cyanurate surface-treated with fine silica increased. However, the degree of the reduction in mechanical strength was minimized and the flame resistance was improved by the additional use of a phosphoric acid ester, leading to the completion of the present invention.
That is, it was found that a fla
REFERENCES:
patent: 5204393 (1993-04-01), Nalepa et al.
patent: 5475041 (1995-12-01), Weil et al.
patent: 5510059 (1996-04-01), Yuki et al.
Takahashi Miki
Uchida Kouji
Aicello Chemical Co., Ltd.
Morgan Kriellion S.
LandOfFree
Flame retardant resin composition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flame retardant resin composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flame retardant resin composition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2048350