Anaerobic sealant composition and method of preparation
AssigneeFelt Products Mfg. Co.
InventorsDonald J. McDowell, Purshottam S. Patel
Life of this patent
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Abstract
An anaerobic sealant composition capable of polymerizing upon exclusion of air comprises (1) a polyacrylic ester monomer, (2) an inorganic salt initiator which can be a persulfate or a perchlorate of ammonium, alkali metal or an alkaline earth metal, (3) an accelerator which can be a N,N-di(lower alkyl) amide of a monocarboxylic aliphatic acid, an organic carboximide of a polycarboxylic acid, or an organic sulfimide of a carboxylic acid, and (4) a quinone-type polymerization inhibitor. The composition is prepared by compounding the aforementioned ingredients and suitably aging the resulting formulation.
Claims41
An anaerobic sealant composition having an extended shelf life in the presence of air and capable of polymerization upon exclusion of air which comprises;
- a polyacrylic ester monomer represented by the general formula ##EQU5## wherein R is a member of the group consisting of hydrogen, alkyl containing 1 to 4 carbon atoms, inclusive, hydroxy alkyl containing 1 to 4 carbon atoms, inclusive, and ##EQU6## R' is a member of the group consisting of hydrogen, halogen, and alkyl containing 1 to 4 carbon atoms, inclusive;
- R" is a member of the group consisting of hydrogen, alkyl containing 1 to 4 carbon atoms, inclusive, hydroxy, and ##EQU7## m is an integer having a value of at least 1;
- n is an integer having a value of at least 1;
- and p is an integer having a value of 0 or 1;
- an inorganic salt which is the sole polymerization initiator which is a member of the group consisting of ammonium perchlorate, alkali metal perchlorate, alkaline earth metal perchlorate, ammonium persulfate, alkali metal persulfate, and alkaline earth metal persulfate, present in an amount sufficient to initiate polymerization of the monomer in the absence of air;
- an accelerator present in an amount sufficient to accelerate polymerization of the monomer in the absence of air;
- and
- a polymerization inhibitor in an amount sufficient to retrd polymerization of the monomer during storage of the composition in the presence of air.
A method for preparing an anaerobic sealant composition which comprises the steps of
- forming an admixture of a polyacrylic ester monomer with inorganic salt which is the sole polymerization initiator selected from the group consisting of ammonium perchlorate, alkali metal perchlorate, alkaline earth metal perchlorate, ammonium persulfate, alkali metal persulfate, and alkaline earth metal persulfate, with an accelerator, and with a polymerization inhibitor;
- aging the formed admixture for a time period sufficient to develop anaerobic properties;
- and
- removing solids from the aged admixture.
A composition capable of developing anaerobic properties which comprises:
- 100 parts by weight of a polyacrylic ester monomer represented by the general formula ##EQU8## wherein R is a member of the group consisting of hydrogen, alkyl containing 1 to 4 carbon atoms, inclusive, hydroxy alkyl containing 1 to 4 carbon atoms, inclusive, and ##EQU9## R' is a member of the group consisting of hydrogen, halogen, and alkyl containing 1 to 4 carbon atoms, inclusive;
- R" is a member of the group consisting of hydrogen, alkyl containing 1 to 4 carbon atoms, inclusive, hydroxy, and ##EQU10## m is an integer having a value of at least 1;
- n is an integer having a value of at least 1;
- and p is an integer having a value of 0 or 1;
- up to about 20 parts by weight of an inorganic salt which is the sole polymerization initiator which is a member of the group consisting of ammonium perchlorate, alkali metal perchlorate, alkaline earth metal perchlorate, ammonium persulfate, alkali metal persulfate, and alkaline earth metal persulfate, present in an amount sufficient to initiate polymerization of the monomer in the absence of air;
- an accelerator present in an amount sufficient to accelerate polymerization of the monomer in the absence of air;
- and
- a polymerization inhibitor in an amount sufficient to retard polymerization of the monomer during storage of the composition in the presence of air.
Dependencies are inferred from the claim text.